Abstract The Montana State Board of Entomology and the Montana State Board of Health studied Rocky Mountain spotted fever (also known as tick fever) in the Bitterroot Valley. Records of the State Board of Entomology consist of correspondence (1909-1954) of State Entomologist R.A. Cooley and others; minutes (1913-1949); reports (1909-1949); subject files; writings; and miscellany. Records of the State Board of Health consist of correspondence (1908-1957) concerning the Rocky Mountain Laboratory and...