This block of four 6-cent postage stamps was issued by the US Post Office to focus attention on the need for pollution control in the United States.
Issue Date: October 28, 1970
First City: San Clemente, CA
Printed By: Bureau of Engraving and Printing
Printing Method: Photogravure
Perforations: 11 x 10 ½
Mint, never hinged condition.
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