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The U.S. Public Health Service building in Washington, D.C., completed circa 1933. In 1931, J.R. Ridlon and C.L. Williams of the USPHS wrote a series of memos describing the use of Zyklon-B as a fumigant.
"Excerpts from the U.S. Public Health Reports (1931)"Leaving the cumbersome, laborious, and time-consuming sulphur fumigation, we have passed through the method of generating HCN, with its still cumbersome apparatus and paraphernalia, through the period of liquid HCN, complicated by the difficulty of transporting so dangerous a material, and have arrived at the exceedingly simple procedure of knocking a hole in a can of Zyklon, pouring the contents down the hold, and throwing the can overboard.
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