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Letter from H.W. Ambruster to Laurence Howard Regarding Ergot
A letter from H. W. Ambruster regarding the selling of "adulterated, impure and putrid" ergot in Massachusetts
Telegram from H.W. Ambruster to Walter G. Campbell, U.S. Department of Agriculture
Telegram sent to Walter G. Campbell, U.S. Department of Agriculture regarding impure ergot.
Article from the New England Journal of Medicine Regarding Howard W. Ambruster and the Ergot Controversey
Article printed in the New England Journal of Medicine, Volume 20 No. 26 p 1348, June 27, 1929 regarding Howard W. Ambruster and the Ergot Controversey