RECENT PUBLICATIONS 
—Ross, C.S. Structure and Oil and Gas Resources of the Osage Reservation, 
Oklahoma. Tps. 20 and 21 N., R. 12 E. [U.S. Geological Survey, 
Bulletin 686-N. Washington, 1919.] 
—SCHALLER, W.T. Micain1o18. [U.S. Geological Survey, Mineral Resour- 
ces of the United States, 1918. Part II: 26. Washington, 1920.| 
Thorium, Zirconium, and Rare-Earth Minerals in 1919. [U-S. 
Geological Survey, Mineral Resources of the United States, r919. Part 
II: 1. Washington, 1920.] 
—SCHOFIELD, S. J. Geology and Ore Deposits of Ainsworth Mining Camp, 
British Columbia. [Canada Department of Mines. Geological Survey, 
No. 99, Geological Series. Memoir 117. No. 1773. Ottawa, 1920.] 
—Scuuttz, A. R. A Geologic Reconnaissance, for Phosphate and Coal in 
Southeastern Idaho and Western Wyoming. [U.S. Geological Survey, 
Bulletin 680, 1918. Washington, ror1g.| 
—SCHWENNESEN, A. T. Ground Water in the Animas, Playas, Hachita, and 
San Luis Basins, New Mexico. With Analyses of Water and Soil, by 
R. F. Hare. [U.S. Geological Survey, Water-Supply Paper 422. Wash- 
ington, ror9.| 
—SCHWENNESEN, A. T., AND MeErtnzER, O. E. Ground Water in Quincy 
Valley, Washington. [U.S. Geological Survey, Water-Supply Paper 
425-E. Washington, ror9.| 
—Scientia, Vol. XX VII, N. XCVI-a Series II. [Bologna: Nicola Zanichelli, 
1920.] 
—SmitH, GEORGE Otis. Economic Limits to Domestic Independence in 
Minerals. [U.S. Geological Survey, Mineral Resources of the United 
States, 1917. Part I: A. Washington, 1o19.| 
U.S. Geological Survey, Thirty-ninth Annual Report for the Fiscal 
Year Ended June 30, 1918. [Washington, ror9.] 
—STANTON, T. W., AND VAUGHAN, T. W. The Fauna of the Cannonball 
Marine Member of the Lance Formation. [U.S. Geological Survey, 
Professional Paper 128-A. Washington, 1920.] 
—STEBINGER, Eugene. Oil and Gas Geology of the Birch Creek-Sun River 
Area, Northwestern Montana. [U.S. Geological Survey, Bulletin 691-E. 
Washington, ror9.| 
—STEPHENSON, L. W. A Contribution to the Geology of Northeastern 
Texas and Southern Oklahoma. [U.S. Geological Survey, Professional 
Paper 120-H. Washington, ro19.] 
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