Pages 91-102; The one serious attempt to commercialize the oil shales of Montana is made by the Dillon Oil Co., which early in 1919 installed a small [ ]nt (capacity 50 tons daily) in Smallhorn Canyon, 12 miles south of Dillon. This retort, which is of the Galloupe type, was used for test [ ] during the summer of 1919 but has since been idle practically all the time.