National Museum of American History (U.S.). Archives Center. Register of the William J. Hammer collection, c.1874-1935, 1955-1957 / by Robert S. Harding.

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National Museum of American History (U.S.). Archives Center.

Register of the William J. Hammer collection, c.1874-1935, 1955-1957 / by Robert S. Harding.

Hammer, William Joseph, 1858-1934 -- Archives.

Harding, Robert S. (Robert Steven), 1944-