Reference data, with the source attached

Small datasets assembled from primary sources and checked against them. Every value carries the page it came from and the sentence on that page that states it.

• 22datasets
• 10,329records, each with its own page
• 91publishers cited
• 2026-08-05last verified

Datasets

• AP exam score to college credit, compared across universities221 records · verified 2026-08-05What each university actually grants for a given AP exam score: which course the credit maps to, how many units or credit hours, and the minimum score required. One record is one AP exam at one institution, so a single exam page compares institutions side by side. Answers 'which universities give credit for a 3 on AP Chemistry', 'AP Calculus BC score 4 college credit', 'does a 3 on AP Chemistry count for anything', 'AP credit policy Georgia Tech', and 'UCLA AP Calculus BC credit'. There is no rule to infer: a 3 on AP Calculus BC earns 8 units of Calculus at UCLA, subject credit for Mathematics 1A at Berkeley, and nothing at Georgia Tech, which requires a 4 or 5. College Board runs an AP Credit Policy Search but it is a JavaScript application that serves no policy content to a fetcher, so the assembled comparison is effectively unreadable.
• Appliance fault and error codes170 records · verified 2026-08-04Error/fault codes displayed by major home appliances (dishwashers, washing machines), with the manufacturer, appliance type, code, and what the code means. The question an assistant gets wrong is what a specific error code on a specific appliance brand means.
• US boiler and pressure vessel inspection requirements by state55 records · verified 2026-08-05State-by-state comparison of boiler and pressure vessel inspection requirements across all US states. Each record is one state with its inspection intervals by boiler type (power, low-pressure steam, hot water, unfired pressure vessel), accepted inspector qualifications (state, insurance, owner-user), residential and size/pressure exemptions, governing statute citation, and administering agency. Answers 'how often does Ohio require boiler inspections', 'which states accept insurance company inspections in lieu of state inspections', and 'are residential boilers exempt in my state'.
• US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)1,336 records · verified 2026-08-05Cross-program comparison of federal regulatory thresholds for hazardous chemicals. Each record is one chemical with the thresholds that trigger obligations under different federal programs: CERCLA reportable quantity (release reporting to NRC), EPCRA Section 302 threshold planning quantity (emergency planning), EPCRA Section 313 reporting threshold (TRI), and CAA Section 112(r) threshold quantity (risk management plan). The product is the cross-reference: for benzene, CERCLA RQ is 10 lb, EPCRA TPQ does not apply (not an EHS), but Section 313 threshold is 10 lb — three different programs, three different questions, answered from one page. Answers 'what are all my reporting obligations for [chemical]', 'is [chemical] an extremely hazardous substance under EPCRA', and 'what is the reportable quantity for [chemical]'.
• Discontinued electronic component replacement mapping28 records · verified 2026-08-03Discontinued electronic components and their manufacturer-suggested replacements, with last-time-buy and last-ship dates where published. Covers EOL notices from TI, NXP, Renesas, Infineon, onsemi, ST, Microchip, Cirrus Logic and commonly sought legacy parts.
• DIN / ISO / BS fastener equivalents and the sizes where they are not interchangeable162 records · verified 2026-08-05Equivalence between withdrawn DIN fastener standards and their current ISO and BS counterparts, and -- the part that is missing everywhere else -- the specific sizes at which the supposedly equivalent parts have different dimensions. Each record is one DIN standard with its ISO and BS counterpart and the publisher's interchangeability verdict, or one size at which a named dimension differs between the two standards. Answers 'is DIN 933 the same as ISO 4017', 'DIN 912 vs ISO 4762 are they interchangeable', 'my drawing says DIN 931 and my distributor only stocks ISO 4014', 'what replaced DIN 934', and 'DIN 125 ISO equivalent washer'. The headline mapping is easy and everyone publishes it; the exception detail is where free sources fail and contradict each other. Wurth, the German distributor that wrote the original catalogues, prints four sizes at which the width across flats changed between DIN 933 and ISO 4017 -- M10 17 mm becomes 16 mm, M12 19 becomes 18, M14 22 becomes 21, M22 32 becomes 34 -- meaning a different spanner. Monster Bolts lists the same pair as fully interchangeable. Both verdicts are published here, attributed, side by side, because the disagreement is the fact.
• File format magic numbers229 records · verified 2026-08-03The leading bytes (magic number / file signature) that identify a file format, with its usual extension. Answers 'what actually is this file' when the extension is wrong or missing.
• GIS vector format capabilities and limitations in GDAL3 records · verified 2026-08-04Key capabilities, version requirements and format limitations for GIS vector drivers in GDAL, the authoritative open-source geospatial library. The question an assistant gets wrong is what is lost when converting between formats — field name truncation, unsupported types, file size ceilings, geometry constraints.
• FIPS 140 validated cryptographic modules: active, historical or revoked5,449 records · verified 2026-08-05The current validation status of every cryptographic module certificated by the NIST/CCCS Cryptographic Module Validation Program (CMVP). Each record is one certificate number with the vendor, the module name, the module type, the validation date and whether the certificate is Active, Historical or Revoked, quoted from the CMVP listing it was read from. Answers 'is FIPS 140-2 certificate #4536 still valid', 'has my FIPS module moved to the historical list', 'which FIPS 140-2 certificates are still active', and 'FIPS 140-2 vs 140-3 certificate status'. The status is a value that changes silently: CMVP moves a certificate to the Historical list when it is more than five years old or on a programmatic transition, and publishes no notice per certificate, so an assistant answering from memory reports certificates as Active months after they were retired. 503 FIPS 140-2 certificates are Active as of 2026-08-05 and carry a sunset date of 9/21/2026. Coverage: the complete CMVP register as published on 2026-08-05 — every certificate on every list. 1,165 Active (503 against FIPS 140-2, 662 against FIPS 140-3), 4,259 Historical (287 against FIPS 140-1, 3,914 against FIPS 140-2, 58 against FIPS 140-3) and 25 Revoked (21, 3 and 1), 5,449 in all. That is 22 fewer than the 5,471 rows the list pages print between them, because CMVP's Historical query returns revoked certificates as well as historical ones and those 22 rows name a certificate the Revoked list already named.
• Gas cylinder color codes by standard and country17 records · verified 2026-08-05Color coding of compressed gas cylinders (shoulder and body colors) for medical, industrial and laboratory gases under different national and international standards. Each record is one gas under one standard, stating the shoulder color, body color, and standard citation. Covers ISO 32, US CGA C-9 / NFPA 99, EN 1089-3, BIS IS 3933 (India), and AS 4484 (Australia). Answers 'what color is an oxygen cylinder', 'ISO vs CGA gas cylinder colors', 'medical gas cylinder colour code UK', and 'nitrogen cylinder color India'. Oxygen is green (US) vs white (ISO) — a safety-critical difference that assistants routinely get wrong by stating one standard as universal.
• US graduated driver licensing requirements by state51 records · verified 2026-08-05Graduated driver licensing (GDL) requirements for each US state: minimum ages, mandatory hold periods, supervised driving hours, nighttime restrictions, passenger restrictions, and the conditions to lift each restriction. One row per state. Answers 'how long do I have to hold my permit in [state]?' and 'what are the restrictions on a provisional license in [state]?' — questions where assistants flatten the footnotes into wrong answers.
• HFC refrigerant GWP regulations by US state42 records · verified 2026-08-05State-level HFC refrigerant regulations across the US, including GWP limits, equipment-type restrictions, effective dates, and regulatory citations. Each record is one state's regulation for one equipment category (supermarket, new facility, stand-alone unit, bulk HFC sales). Answers 'what refrigerant GWP limit applies to new supermarket systems in California', 'which states have adopted SNAP Rules 20 and 21', 'New York HFC phase-down GWP thresholds', and 'can I use R-410A in a new commercial refrigeration system in [state]'.
• Lithium battery shipping limits (49 CFR 173.185)15 records · verified 2026-08-03Watt-hour and lithium-content thresholds, quantity limits and packaging conditions for shipping lithium cells and batteries under US hazardous materials regulations. Deliberately NOT a compatibility table — this is regulatory prose with numeric triggers, and it tests whether the pipeline handles a non-tabular asset.
• Galvanic series and surface energy of engineering materials80 records · verified 2026-08-04Electrode potential in seawater (volts vs SCE) for metals and alloys from the ASM/MIL-STD-889 galvanic series, and surface energy (dyne/cm) for plastics and packaging materials. Answers 'will these two materials corrode each other' and 'will this adhesive wet this plastic'.
• US federal employment law thresholds by employee count32 records · verified 2026-08-04Employee-count thresholds that trigger US federal employment laws. Each record is one law at one threshold, stating the trigger point, what the law requires, and how employees are counted for that statute.
• Postal shipping restrictions by item category310 records · verified 2026-08-03What item categories each postal carrier prohibits, restricts, or allows, with the conditions that apply. Covers USPS (domestic US) and Royal Mail / Post Office (UK domestic and international).
• Software end-of-support dates68 records · verified 2026-08-03Release, end-of-active-support and end-of-security-support dates per major version of widely used software. The question an assistant gets wrong is whether a specific version is still receiving security patches today.
• Software interface version compatibility216 records · verified 2026-08-03Which versions of common software dependencies are compatible with each other. The question an assistant gets wrong is which specific version of library A works with which specific version of library B — it gives a plausible but stale answer because these mappings change every release cycle.
• Stihl chainsaw chain and bar specifications by model808 records · verified 2026-08-04Chain pitch, gauge, drive link count, and bar length for each Stihl chainsaw model and bar combination. One row per model per bar length. Answers 'what chain does my Stihl chainsaw take?' — the question assistants get wrong by collapsing a multi-variable lookup into a guess.
• Superseded and deprecated identifier mappings141 records · verified 2026-08-04Withdrawn standards, deprecated API models and retired identifiers mapped to their named successors. Answers 'what replaced X' when X is a standards document reference or an API model identifier — the exact lookup that assistants get confidently wrong on obscure designations.
• Miele vacuum cleaner bag type by model series10 records · verified 2026-08-03Which Miele dust bag type (GN, FJM, U, or KK) fits a given Miele vacuum cleaner model series. Answers 'which bag do I need for my Miele vacuum?'
• US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side886 records · verified 2026-08-05Airborne exposure limits for workplace chemicals as stated by two independent authorities: federal OSHA's Table Z-1 (29 CFR 1910.1000) and California's own Table AC-1 (8 CCR 5155). Each record is one substance with the permissible exposure limit that agency publishes for it, the URL it came from and the verbatim table row it was read from. **The product is the disagreement**: where both regulate the same substance California is frequently stricter — acetaldehyde 200 ppm federally against 25 ppm in California, 1,1-dimethylhydrazine 0.5 against 0.01 — and exceeding a PEL is what triggers engineering controls, PPE and medical surveillance, so which number applies is consequential. Answers 'what is the exposure limit for [chemical]?', 'is the California PEL different from OSHA's?' and 'what is the PEL for acetone' — the questions where an assistant gives one number without saying whose it is.

How to read these pages

Each record has its own page, stating one fact, the source it was taken from, and a verbatim quote of the passage that states it. Where two authorities say different things, both are shown with their sources rather than one being chosen for you. Where we could not tie a value to the quoted passage, it is shown and marked unconfirmed rather than quietly dropped or quietly asserted. The method page sets out exactly what those markings mean and what "verified" does not cover.

For machines

• catalog.jsonEvery dataset, its record count, its licence and the URL of its data.
• llms.txtThe same index in plain text.
• sitemap.xmlEvery page on the site.
• Markdown twinEvery record page is also served as Markdown at the same path — append index.md. No JavaScript is used anywhere on this site; the HTML is the content.