American foulbrood and its control Vansell, George H. (George Haymaker), 1892-1954 creator text book Berkeley, Calif University of California, College of Agriculture, Agricultural Experiment Station 1926 1926
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ENG American foulbrood Bees Diseases Circular (California Agricultural Experiment Station), 307 https://www.biodiversitylibrary.org/bibliography/59713 10.5962/bhl.title.59713 RQF