Alexander Orr Vietor (1913 – March 9, 1981) was an American authority on marine Americana and maps.
A graduate of Yale in the class of 1936, he served as curator of maps at Yale University from 1943 to 1978.
He was a member of the board of the New-York Historical Society and of the Acorn Club, to which he was elected in 1953.
He married Anna Glen Butler; they had four daughters and three sons.
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