v0.9.29
Expanded United States issued-stamp catalogue
Added independently confirmed United States stamp identities and richer source-backed catalogue details.
Changes
- Reconciled US Stamp Gallery and The Swedish Tiger records using dates, denominations, and stamp designs.
- Added verified issued-stamp records without treating booklet, coil, reprint, or other minor format differences as new stamps.
- Preserved existing catalogue IDs and collection links while adding source provenance and missing factual metadata.