Random triples
| Subject | Object |
|---|---|
| gptkb:Black_Heritage_Series | commemorative stamp |
| gptkb:Federal_Duck_Stamp_Program | revenue stamp |
| gptkb:Federal_Duck_Stamp_Program | hunting license |
| gptkb:American_Scientists_Series | commemorative stamp |
| gptkb:Migratory_Bird_Hunting_Stamp_Act | gptkb:Federal_Duck_Stamp |
| gptkb:Jubilee_Issue | definitive |
| gptkb:First-Class_postage | First-Class stamp |
| gptkb:Europa_CEPT | commemorative stamp |
| gptkb:American_Lighthouses_Series | commemorative stamp |
| gptkb:U.S._Lighthouse_Service_series | commemorative stamp |