Tags: Engineer.
Peter G. Keller (1894–1972) of New York was a stamp dealer who along with his wife Helen Van Zilen Keller helped develop the organization of stamp dealers in the United States.
Tags: Engineer.
Peter G. Keller (1894–1972) of New York was a stamp dealer who along with his wife Helen Van Zilen Keller helped develop the organization of stamp dealers in the United States.
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