1981 18¢ American Architecture - 4 Varieties, Attached Plate Block

United States #2019-22 20¢ American Architecture - 4 Varieties, Attached Plate Block Varieties include: #2019 - Fallingwater Mill Run #2020 - Illinois Institution of Technology #2021 - Gropius...

United States #1912-19 18¢ Space Achievements - 8 Varieties, Attached Plate Block Varieties include: #1912 - Exploring the Moon #1913 - Releasing Boosters #1914 - Cooling Electric Systems #1915...

United States #1779-82 15¢ Architecture - 4 Varieties, Attached Plate Block Varieties: #1775 - Virginia Rotunda #1775 - Baltimore Cathedral #1775 - Boston State House #1775 - Philadelphia...

United States #1942-45 20¢ Desert Plants - 4 Varieties, Attached Plate Block Varieties include: #1942 - Barrel Cactus #1943 - Agave #1944 - Beavertail Cactus #1945 - Saguaro *Plate number and...

United States #1937-38 18¢ Yorktown/Virginia Capes - 2 Varieties, Attached Plate Block Varieties include: #1937 - Yorktown #1938 - Virginia Capes *Plate number and position may vary from image...

United States #1928-31M 18¢ American Architecture Mint Se-tenant Block of 4

United States #1749-52 13¢ American Dance - 4 Varieties, Attached Plate Block Varieties: #1749 - Ballet #1750 - Theater #1751 - Folk #1752 - Modern *Plate number and position may vary from image...

United States #1760-63 15¢ American Owls - 4 Varieties, Attached Plate Block Varieties: #1760 - Great Gray Owl #1761 - Saw-Whet Owl #1762 - Barred Owl #1763 - Great Horned Owl *Plate number and...

United States #3661-64 - 37¢ American Bats - 4 Varieties, Attached Self-Adhesive Plate Block Varieties include: #3661 - Red Bat #3662 - Leaf-nosed Bat #3663 - Pallid Bat #3664 - Spotted Bat *Plate...