Preserve the Environment - Expo 74 World's Fair Block of Stamps

OFFICIAL FIRST DAY OF ISSUE Preserve the Art ENVIRONMENT SPOKAN APR. 18 1974 99210 WA EXPO'74 US100 PRESERVE THE ENVIRONMENT ada da EXPO'74 US10¢ PRESERVE THE ENVIRONMENT Lindsey 43142. Nelson expo 74 world's fair plona, Ill. EXPO74 US10c FRESERVYE THE ENVIRONMENT CCCCCC C C O EXPO'74 US100 PRESERVE THE ENVIRONMENT .