Energy Conservation - It is estimated that only a 40 year reserve of oil remains in the earth Block of Stamps

OFFICIAL FIRST DAY OF ISSUE ENERGY CONSERVATION IT IS ESTIMATED THAT ONLY A 40 YEAR RESERVE OF OIL REMAINS IN THE EARTH Art Craft DETA SEP 23 1974 48233 MI EN ER CONSERVATION CONSERVATION 109 FIRST DAY TO¢ CONSERVATION CONSERVATION 10 10 STATES