v0.9.30
Completed United States catalogue gap fill
Filled historical United States catalogue gaps with clearly identified issued stamps while preserving official-source priority.
Changes
- Added clearly dated and denominated United States stamp designs from a reviewed secondary catalogue where official historical coverage was incomplete.
- Kept official and public-institutional facts authoritative and prevented booklet, coil, reprint, and other minor variants from creating extra catalogue stamps.
- Preserved existing catalogue IDs, collection links, WNS references, and manual values while recording source provenance for new stamps.