USPS issues postcard stamps featuring coral reefs
Postal Service Issues New Postcard StampsWASHINGTON — Celebrate the beauty and wonder of coral reefs with four new postcard stamps from the U.S. Postal Service. The Coral Reefs stamps will be available nationwide March 29 in Post Offices and online at the Postal Store. Polyps make stony corals, the foundation for most coral reefs, by secreting protective skeletons of calcium carbonate or limestone. Coral reefs are some of the world’s most marvelous ecosystems, sheltering and sustaining about a q
