00896cam a22002411 4500 gs 25000364 DLC 20260227111329.0 760625s1925 xx 000 0 eng c gs 25000364 (OCoLC)2281975 U.S. Geol. Survey. Library TxEU DLC premarc TN871 .M6 Moulton, Gail Francis, 1898- Proper testing for oil structures in Illinois and some areas deserving such testing, by Gail F. Moulton. Urbana, Ill., 1925. 22 p. illus., tables., diagrs. 25 cm. Illinois State Geological Survey Report of investigations, no. 6 At head of title: State of Illinois. Department of registration and education. Division of the State geological survey. Petroleum Illinois. Petroleum Testing. 26405 26405