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Images: 'Covering' Alvin's History

To celebrate Alvin's 50th anniversary, local philatelists worked with WHOI to create postal "covers"—empty envelopes decorated with Alvin logos, signed by members of the team that operates Alvin, and canceled and posted on June 5, 2014, the 50th anniversary of Alvin's commissioning. (Courtesy of Nancy Clark, Spellman Museum of Stamps and Postal History)
This ink stamp for early Alvin dive covers depicts the sub's original rounded shape (Laurence Madin, Woods Hole Oceanographic Institution )
This Alvin dive cover marks Alvin's thousandth dive in 1980. (Courtesy of Ed Hayes)
Alvin's first dive in the Mediterranean, commemorated by this cover, was the beginning of Alvin's participation in the search for a U.S. hydrogen bomb missing off the coast of Spain. (Courtesy of Ed Hayes)
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