Water Conservation - 7th National Watershed Congress Washington D.C. 1960 Block of Stamps

OFFICIAL FIRST DAY COVER PROTECT WATERSHEDS-- CONSERVE WATER WATER Art Craft Conservation 7TH NATIONAL WATERSHED CONGRESS WASHINGTON, D.C. 1960 APR 18 9-AM Z 1960 D.C. WATER IS LIFE WATER CONSERVATION +f BST DAY OF WATER CONSERVATION WATER CONSERVATION ++ Geggoooooooooooooo WATER CONSERVATION ff UNITED STATES POSTAGE