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New US Issues - USPS Hails Science, an American Legend and
U.S. Postal Service Unveils Winter Woodland Animals Stamps
Caroline Tavelli-Abar : Collage : Conversation with postage
USPS — Stamp Art — Earth Day - VeVe Digital Collectibles
ESA's Euclid Mission Launches to Explore 'Dark Universe' - NASA
Smithsonian
U.N. Earth Day stamps feature environmental art
Photos Department of Commerce
This Day in History - Earth Day Stamps