# Dated Source Ledger

Research cutoff and retrieval date: **2026-07-23**.

Sources were located and checked with focused `parallel-cli search` queries and
canonical-page `parallel-cli extract` calls. Only first-party or primary
methodological sources are listed below. Dates are publication, document, or
last-revised dates stated by the source; `not stated` is used rather than
guessing.

## Corporate filings and U.S. official data

| ID | Authority | Source and date | Use |
|---|---|---|---|
| SRC-SEC-ACCESS | U.S. SEC | [Accessing EDGAR Data](https://www.sec.gov/search-filings/edgar-search-assistance/accessing-edgar-data), published 2021-03-23; updated 2024-06-26 | EDGAR history, corrections, declared user agent, 10 requests/second fair-access limit |
| SRC-SEC-DEV | U.S. SEC | [Developer Resources](https://www.sec.gov/about/developer-resources), updated 2025-03-10 | Submissions and XBRL APIs; fair-access overview |
| SRC-CENSUS-API | U.S. Census Bureau | [Census Data API User Guide](https://www.census.gov/data/developers/guidance/api-user-guide.html), dated 2026-05-12; revised 2026-05-14 | Geography/vintage concepts and API navigation |
| SRC-CENSUS-LIMIT | U.S. Census Bureau | [Query Limits](https://www.census.gov/data/developers/guidance/api-user-guide.Query_Limits.html), revised 2026-05-14 | 50 variables/query; key required for data queries |
| SRC-CENSUS-KEY | U.S. Census Bureau | [API Key](https://www.census.gov/data/developers/guidance/api-user-guide.API_Key.html), revised 2026-05-14 | Current free key-registration guidance |
| SRC-EC-METHOD | U.S. Census Bureau | [2022 Economic Census Methodology](https://www.census.gov/programs-surveys/economic-census/year/2022/technical-documentation/methodology.html), updated 2026-04-10 | Population, frame, NAICS scope, collection, administrative data, imputation, disclosure avoidance |
| SRC-NAICS | U.S. Census Bureau | [NAICS](https://www.census.gov/naics), revised 2026-07-23 | Current 2022 structure and 2027 revision process |
| SRC-BLS-API | U.S. Bureau of Labor Statistics | [Public Data API FAQ](https://www.bls.gov/developers/api_faqs.htm), modified 2023-08-30 | Registration, daily/rate/series/year limits, metadata behavior |
| SRC-BEA-API | U.S. Bureau of Economic Analysis | [BEA API User Guide](https://apps.bea.gov/api/_pdf/bea_web_service_api_user_guide.pdf), 2026-04-20 | UserID, metadata calls, 100 requests/minute, 100 MB/minute, 30 errors/minute, HTTP 429/retry |
| SRC-BEA-CHAIN | U.S. Bureau of Economic Analysis | [Chained-Dollar Indexes: Issues and Tips](https://www.bea.gov/resources/methodologies/chained-dollar-indexes), published 2003-11; page modified 2018-05-30 | Real/current measures, chain weighting, non-additivity |
| SRC-FRED-API | Federal Reserve Bank of St. Louis | [FRED API](https://fred.stlouisfed.org/docs/api/fred/), date not stated | v1 series/ALFRED access; v2 bulk release history; metadata and vintage endpoints |
| SRC-FRED-TERMS | Federal Reserve Bank of St. Louis | [FRED API Terms](https://fred.stlouisfed.org/docs/api/terms_of_use.html), date not stated | Key requirement, changeable limits, application notice, third-party rights |

## International and national statistical systems

| ID | Authority | Source and date | Use |
|---|---|---|---|
| SRC-WB-API | World Bank | [Indicators API Documentation](https://datahelpdesk.worldbank.org/knowledgebase/articles/889392-about-the-indicators-api-documentation), date not stated | v2 current; v1 discontinued; no API authentication; source metadata |
| SRC-WB-WDI | World Bank | [World Development Indicators catalog](https://datacatalog.worldbank.org/search/dataset/0037712/world-development-indicators), updated 2026-07-22 | Metadata, classifications, and revision-history resources |
| SRC-IMF-API | International Monetary Fund | [IMF Data APIs](https://data.imf.org/en/Resource-Pages/IMF-API), page dated 2026 | SDMX 2.1 and 3.0 access |
| SRC-IMF-SDMX | International Monetary Fund | [IMF SDMX Central Web Services Guide](https://dsbb.imf.org/content/pdfs/IMFSDMXCentralWebServicesGuide.pdf), updated 2025-05 | Structures, codelists, schemas, and SDMX services |
| SRC-OECD-API | OECD | [OECD data via API](https://www.oecd.org/en/data/insights/data-explainers/2024/09/api.html), 2025-04-30 | SDMX syntax, dataflow version warning, formats, terms, nonnumeric rate-limiting statement |
| SRC-OECD-SUT | OECD | [Supply and Use Tables](https://www.oecd.org/en/data/datasets/supply-and-use-tables.html), date not stated | Product/industry supply-use framework and origin/use of goods and services |
| SRC-EUROSTAT-API | Eurostat | [API Introduction](https://ec.europa.eu/eurostat/web/user-guides/data-browser/api-data-access/api-introduction), date not stated | Statistics/SDMX services, formats, twice-daily updates, latest-version-only caveat |
| SRC-ESS-QUALITY | Eurostat | [ESS Handbook for Quality and Metadata Reports](https://ec.europa.eu/eurostat/web/products-manuals-and-guidelines/-/ks-gq-21-021), 2021-12-09 | Standardized quality and metadata reporting |
| SRC-NACE | Eurostat | [NACE Rev. 2.1 manual announcement](https://ec.europa.eu/eurostat/web/products-eurostat-news/w/wdn-20250624-1), 2025-06-24 | Current NACE manual, principles, explanatory notes, correspondence tables |
| SRC-STATCAN-WDS | Statistics Canada | [Web Data Service User Guide](https://www.statcan.gc.ca/en/developers/wds/user-guide), revision 1.6 dated 2025-01-24 | Data/metadata service, update window, 50 server and 25 per-IP requests/second |
| SRC-ONS-API | UK Office for National Statistics | [ONS Developer Hub](https://developer.ons.gov.uk/), date not stated; beta | Open/no-key API; dataset/edition/version and breaking-change warning |

## Market definition, uncertainty, and research methods

| ID | Authority | Source and date | Use |
|---|---|---|---|
| SRC-US-MERGER | U.S. DOJ and FTC | [2023 Merger Guidelines](https://www.ftc.gov/system/files/ftc_gov/pdf/2023_merger_guidelines_final_12.18.2023.pdf), 2023-12-18 | Relevant markets, shares, HHI, evidence, dynamic and potential competition |
| SRC-EU-MARKET | European Commission | [Market Definition Notice](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:C_202401645), 2024-02-22 | Product/geographic scope, non-price competition, digital/dynamic markets, alternate share metrics, evidence |
| SRC-OMB-A4 | U.S. Office of Management and Budget | [Circular A-4](https://www.whitehouse.gov/wp-content/uploads/2023/11/CircularA-4.pdf), 2023-11-09 | Evidence quality, uncertainty, sensitivity, assumptions, transparent presentation |
| SRC-GREENBOOK | UK HM Treasury | [The Green Book 2026](https://www.gov.uk/government/publications/the-green-book-appraisal-and-evaluation-in-central-government/the-green-book-2026), 2026-03-10 | Appraisal, options, uncertainty, evidence, and transparent assumptions |
| SRC-AAPOR-CODE | American Association for Public Opinion Research | [Code of Professional Ethics and Practices](https://aapor.org/standards-and-ethics/), revised 2026-06 | Current participant, privacy, sponsor, public, integrity, and disclosure duties |
| SRC-AAPOR-DISC | American Association for Public Opinion Research | [Disclosure Standards](https://aapor.org/standards-and-ethics/disclosure-standards/), code approved 2021-04; page published 2022-12-02 | Sponsor, instrument, population, sample, mode, dates, weighting, precision, limitations, privacy |
| SRC-AAPOR-BEST | AAPOR | [Best Practices for Survey Research](https://aapor.org/standards-and-ethics/best-practices/), page published 2023-01-11 | Survey design, probability/non-probability samples, wording, weighting, reporting |
| SRC-FCSM-NR | Federal Committee on Statistical Methodology | [Best Practices for Nonresponse Bias Reporting](https://statspolicy.gov/assets/fcsm/files/docs/FCSM%20NRBA%20Report%20062623.pdf), 2023-06 | Response-rate and subgroup nonresponse-bias reporting |
| SRC-ICSP-QUALITY | Interagency Council on Statistical Policy | [Principles for Modernizing Production of Federal Statistics](https://statspolicy.gov/assets/fcsm/files/docs/Principles-2.pdf), 2018 | Quality, transparency, and limitations for statistical/non-statistical integrated data |
| SRC-FORCE11 | FORCE11 | [Joint Declaration of Data Citation Principles](https://force11.org/group/joint-declaration-of-data-citation-principles-final), 2014; page date not stated | Importance, credit, evidence, unique identification, access, persistence, specificity |
| SRC-ICO-MIN | UK Information Commissioner's Office | [Data minimisation](https://ico.org.uk/for-organisations/uk-gdpr-guidance-and-resources/data-protection-principles/a-guide-to-the-data-protection-principles/data-minimisation), updated 2025-09-09 | Collecting data adequate, relevant, and limited to purpose where UK GDPR applies |

## Research query record

Focused search/extract objectives covered:

- SEC EDGAR, Census, BLS, BEA, FRED access, metadata, terms, and limits;
- World Bank, IMF, OECD, Eurostat, Statistics Canada, and ONS APIs;
- NAICS/NACE versions and classification correspondence;
- supply-use/economic-census methods for sizing and double-count prevention;
- U.S. and EU competition/market-definition guidance;
- OMB and HM Treasury forecast uncertainty and sensitivity;
- AAPOR/FCSM survey disclosure and nonresponse;
- data citation, provenance, metadata quality, privacy, and ethical collection.

No Parallel search JSON artifacts are included in the skill.