Watkin, William Ward, 1886-1952. "Letter from William Ward Watkin to Messrs. Adams and Cummins, on Endress and Watkin letterhead, February 24, 1919." (1919) Rice University: http://hdl.handle.net/1911/12945.
Watkin, William Ward, 1886-1952--Correspondence; Cummins, Robert James, 1881-1960--Correspondence
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