E.G. Crabtree, assistant chemist of the U.S. Fish and Wildlife Service, Denver, Colorado, and inventor of a process to exterminate rates, is shown operating the large red squill fortifying plant at the Isolation hospital here for the first time today. Behind him stands Dr. J.A. Henderson, acting director of the city board of health. inspects a plant

Photo is dated 1942.

Photo measures 7 x 9 inches.