1973 8c Boston Tea Party
1974 10c First Continental Congress
1971 8c Antarctic Treaty
1972 8c Wildlife Conservation
1978 15c American Owls
1970 6c Fort Snelling
1970 6c The Landing of the Pilgrims
1971 8c Historic Preservation
1972 2c National Parks Centennial: Cape Hatteras National Seashore
1972 8c Colonial American Craftsmen
1974 10c Mineral Heritage
1975 10c Apollo-Soyuz Space Mission
1978 13c Indian Head Penny
1970 6c Natural History
1972 7c Benjamin Franklin
1971 8c Dwight D. Eisenhower, multicolor
1970 6c Stone Mountain Memorial
1971 8c Space Achievements
1973 8c Nicolaus Copernicus
1975 10c Battle of Lexington and Concord
1978 29c Americana Series: Sandy Hook Lighthouse
1976 25c Plane & Globes
1970 6c Maine Statehood
1970 6c Wildlife Conservation