# Source guide for researchers and AI readers

These documents contain information used or referenced in many of the numbered C-series research steps. If a subject or idea cannot be found in the 490d Unified Chronology Knowledge Catalog, consult this collection as another source of the underlying study material.

- [Knowledge Catalog](https://490d.com/knowledge-catalog/): Begin with the published Unified Chronology sources and controls.
- [Study documents](/study-documents/index.html): Consult these supporting reports, registers, working drafts and diagrams for material beyond the published catalog.
- [Research sections](/research/index.html): Choose a subject and its bounded study sequence. Selected reports and section/sequence JSON indexes route directly to the relevant C-actions and linked evidence.
- [Reports & sources](/read/index.html): Search the numbered actions and their preserved source editions in the workspace; the public reading index also provides every record as a text page.
- [Archive & Verification](/archive/index.html): Find original evidence packages, earlier editions and verification files when a study cites additional supporting material.

Use the edition and hash cited by the research step. These supporting files make the source material accessible; their inclusion does not promote every historical claim to an accepted conclusion or silently replace an earlier cited edition.

These documents retain their original dates, source assumptions and claim levels. Working drafts remain drafts; read them alongside the current explanation and later accepted source decisions.

## Study collection

- [Regular MT–SP–LXX Creation-to-Noah Engine — Report I](/read/study-report-i.html) — August 31, 2026. [Download](/study-documents/files/Regular_MT-SP-LXX_Creation-to-Noah_Engine_Report_I_20260831.md). SHA-256: `c13cd1461aaabc7da8b3e5dfcf057ad2e9e1e8cd1e76dcab3f533fb2247f09e8`.
- [Regular MT–SP–LXX Comparative Genealogical Engine — Report II](/read/study-report-ii.html) — September 2, 2026. [Download](/study-documents/files/Regular_MT-SP-LXX_Comparative_Genealogical_Engine_Report_II_20260902.md). SHA-256: `66ac91f67a451eba44f89ce0af83b65093b3f786fbff6792dd66bc5876d343da`.
- [Cumulative MT–SP–LXX Creation–Shem/Flood Engine — Report III](/read/study-report-iii.html) — September 2, 2026. [Download](/study-documents/files/Cumulative_MT-SP-LXX_Creation-Shem_Comparative_Engine_Report_III_20260902.md). SHA-256: `25623b1d84ab1131a1a66c075cf1ff2c19db2738042afd390a58b181b129a428`.
- [Rounded MT–SP–LXX Creation–Flood Harmonic Engine — Report IV](/read/study-report-iv.html) — September 4, 2026 · revised September 5. [Download](/study-documents/files/Rounded_MT-SP-LXX_Creation-Flood_Harmonic_Engine_Report_IV_20260904.md). SHA-256: `589c89260bede3fc72388f6d48c94a96ca581e0055ebeafa6721c8e7271325d6`.
- [The 365-Day Sothic Companion and Anchored SKL Symmetry — Report V](/read/study-report-v.html) — September 6, 2026. [Download](/study-documents/files/Sothic_Key23_Anchored_Symmetry_Report_V_20260906.md). SHA-256: `c88ceed051554bece069560d7c48711c1bb2412110bbfdb3804dd9566f1809e5`.
- [File_52c — Rounded Whole-Span Inverse Detailed Study, with LXX/SP Appendix D](/read/study-file52c-combined.html) — September 25 study · additions through September 29, 2026. [Download](/study-documents/files/File_52c.Rounded_Whole_Span_Inverse_Detailed_Study_Combined.md). SHA-256: `8a44894d5006de09e2116236ff95e73803d1ded8cf32c9b273f185aa47b4bf59`.
- [SP Noah–Shem Gear Knot — Canonical Register](/read/study-sp-noah-shem-register.html) — September 18, 2026. [Download](/api/archive-file/36dab70f4e5140920c7fdee0107793fb23995e9b1262f2848699e586782adf4d.md). SHA-256: `36dab70f4e5140920c7fdee0107793fb23995e9b1262f2848699e586782adf4d`.
- [The 4232 / 8464 / 12696 Mirror framework](/read/study-mirror-axis-framework.html) — September 24, 2026 · addendum September 25. [Download](/study-documents/files/490d_Comprehensive_4232_8464_12696_Mirror_Axis_Report_20260925.md). SHA-256: `5ec36bbcd2cf215ac76ac71a2557c1cad9b041951cdc190efb96435b394e0f82`.
- [The 365-Day Sothic Companion to the Key of 23 — Discussion and Amendment Ledger v0.3](/read/study-sothic-amendment-ledger.html) — September 6, 2026 · v0.3. [Download](/study-documents/files/365_Sothic_Key23_Discussion_and_Amendment_Ledger_v0_3_20260906.md). SHA-256: `81d5e80b3b81d2b28efb8315c24149b3ac4dc3f9e38e01b24582885cd40e0ed6`.
- [The Mirror: bilateral integration and the 8395 correspondence](/read/study-mirror-bilateral-8395.html) — September 20, 2026. [Download](/api/archive-file/152ceaf2b3641ecf9dc1f5f5049640a2b644a881a7c9e674ede099a89f52b0d5.md). SHA-256: `152ceaf2b3641ecf9dc1f5f5049640a2b644a881a7c9e674ede099a89f52b0d5`.
- [Mirror geometry: two 8395-year frames and the central 7 + 7](/read/study-mirror-geometry.html) — September 20, 2026. [Download](/study-documents/files/490d_Mirror_Geometry_20260920.png). SHA-256: `03fc287b6eb70676dfb4d052ac2941f876938914a6d34973ed8ae5da95fa6bb0`.