# Early Kuhn / LoC Exchange — preserved historical lineage

These three objects are preserved as received. Their C503/C504 terminology and denominators are historical scientific state and must not be silently rewritten as C508.

Lineage role:

C503 population reconstruction → C504 expansion / Kuhn-facing review → Human / source / Reality Return → C508 / iC-See Living Observatory.

The scientific value is not only their conclusions. They show the evolution of the instrument: population-first reconstruction, Passport architecture, Relation × Evidence separation, Bridge/Unknown, Multi-Auditor review, Reality Return, and provenance-preserving correction.