Water Conservation 7th National Watershed Congress Washington, D.C. 1960

OFFICIAL FIRST DAY COVER PROTECT WATERSHEDS-- CONSERVE WATER WATER Conservation 7TH NATIONAL WATERSHED CONGRESS WASHINGTON, D.C. 1960 Art Craft WAS APR 18 9-AM Z 1960 D.C TON WATER IS LIFE WATER CONSERVATION +f FIRST DAY OF ISSUE Irving Fisher 1270 Gerard Ave., Bronx 52, N. Y.