Peter G. Keller (October 13, 1894 – September 15, 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.
Peter G. Keller (October 13, 1894 – September 15, 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. (en)
Peter G. Keller (October 13, 1894 – September 15, 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. (en)