Watkin, William Ward, 1886-1952. "Letter from William Ward Watkin to Mr. Cummins on Endress and Watkin letterhead, undated, possibly circa 1917." (1917) Rice University: http://hdl.handle.net/1911/12941.
Watkin, William Ward, 1886-1952--Correspondence; Cummins, Robert James, 1881-1960 --Correspondence
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