490d Research — Supporting Study Documents, September 30, 2026 Preservation Edition

Preservation snapshot of all 11 supporting study items listed at https://research.490d.com/#study, captured September 30, 2026: ten Markdown research documents and one PNG diagram by Dean Thomas Coombs. These are research sources and supporting studies used or referenced in the larger 490d chronological investigation. Researchers and AI readers can consult this collection when a subject or idea is not located in the 490d Unified Chronology Knowledge Catalog. This is a separate companion deposit to the canonical source corpus: https://zenodo.org/records/23068909. The September 30 date identifies this preservation edition, not a revision date for every source. Original edition dates, source roles, working-draft status, and claim-level qualifications remain in force. Inclusion does not promote every historical claim to an accepted conclusion or replace an earlier cited edition. Preserved documents:1. Regular MT–SP–LXX Creation-to-Noah Engine Report I2. Regular MT–SP–LXX Comparative Genealogical Engine Report II3. Cumulative MT–SP–LXX Creation–Shem Comparative Engine Report III4. Rounded MT–SP–LXX Creation–Flood Harmonic Engine Report IV5. Sothic / Key-of-23 Anchored Symmetry Report V6. File_52c: Rounded Whole-Span Inverse Detailed Study Combined7. SP Noah–Shem Gear Register (download filename GEAR_REGISTER.md)8. Comprehensive 4232 / 8464 / 12696 Mirror Axis Report9. 365 / Sothic / Key-of-23 Discussion and Amendment Ledger v0.310. Mirror Bilateral Integration and 8395 Correspondence Study11. Mirror Geometry diagram (PNG) Download and verification: The complete ZIP preserves the structured directory layout; the source files are also available separately. Begin with START-HERE.html or README-preservation.txt. The published catalog, source guide, source checksums, provenance inventory, and preservation checksums are included. All 11 originals match the published SHA-256 hashes and byte counts, and their bytes are unchanged. Archive aliases are recorded as provenance without duplicating the original payloads within the structured package. The ZIP intentionally aggregates the separately available files. ZIP: 490d-supporting-study-documents-2026-09-30.zip; 588,294 bytes; 21 entries; SHA-256: 18f2743f9e4be838d176893c5644203d108aadf898f8c989b51f6062423d9a2e. The collection-guide capture is an observed browser DOM serialization. Full online HTML readings are linked in the navigation; the authoritative Markdown and PNG originals are preserved in full. The separate C-series research records and large research archives are outside this deposit. Source collection and reader guide: https://research.490d.com/study-documents/Knowledge catalog: https://490d.com/knowledge-catalog/Matching Internet Archive edition: https://archive.org/details/490d-supporting-study-documents-2026-09-30Companion canonical corpus: https://zenodo.org/records/23068909 Rights: No explicit reuse license was found in the inspected study sources. No collection-wide reuse license is newly asserted, and no license from the separate canonical corpus is extended to these supporting files. Existing rights remain with the respective rights holders. See RIGHTS-AND-EDITIONS.txt and the original source material.