USGS
82 MYB Vol-I chapters at their newest published year (rolling 2018-2023)
Source
Feed (what to expect)
Rolling - rerun the regen script when USGS posts newer chapters.
Same event schema + grounding gate as usgs_mcs_prose; regenerate with scripts/regen_myb_prose.py (roster/join = myb_slug_map.json).
Reconciliation
Schema
Feeds (axes)
Record kinds
Identifier schemes
