# External source check (ISJ-SNAPSHOT-20260831)

Checked 2026-09-04 with `scripts/verify-external-sources.py` (GET, follow redirects, 25s timeout). None of these pages audited this fixture. Machine log: [`external-source-check-ISJ-SNAPSHOT-20260831.json`](./external-source-check-ISJ-SNAPSHOT-20260831.json).

| Source | Requested URL | Final URL | HTTP | Title SHA-256 | Note | Use |
|---|---|---|---|---|---|---|
| Manufacturing and Trade Inventories and Sales | https://www.census.gov/mtis/index.html | https://www.census.gov/mtis/index.html | 200 | a850b164f9359d25 |  | Official aggregate inventory/sales statistical context |
| Assessing Data Reliability | https://www.gao.gov/products/gao-20-283g | https://www.gao.gov/products/gao-20-283g | 200 | 4b63162eff92e4ec |  | Accuracy, completeness, and fitness-for-purpose context |
| AQuA Book | https://www.gov.uk/guidance/the-aqua-book | https://www.gov.uk/guidance/the-aqua-book | 200 | f618e2989914313f |  | Analytical quality-assurance context |
| Secure by Design | https://www.cisa.gov/secure-by-design | https://www.cisa.gov/secure-by-design | 404 | c9815cc6859cba21 | http 404 | Secure-default and write-boundary context |
| SEC | https://www.sec.gov/ | https://www.sec.gov/ | 200 | af14ad6191cce91b |  | Filing authority; not a definition for this ops pack |

Keep original requested URLs. Re-check at decision time.