Public domain
Doctor Cooley, one of the pioneers at the Rocky Mountain Laboratory in the study of ticks and development of spotted fever vaccine. USPHS (United States Public Health Service) Rocky Mountain Laboratory. Hamilton, Montana
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDoctor Cooley, one of the pioneers at the Rocky Mountain Laboratory in the study of ticks and development of spotted fever vaccine. USPHS (United States Public Health Service) Rocky Mountain Laborato. 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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