RECENT PUBLICATIONS 
—HENpDERSON, C. W. Gold, Silver, Copper, Lead and Zinc in Colorado 
in 1918. Mines Report. [U.S. Geological Survey, Mineral Resources 
of the United States, 1918. Part I: 27. Washington, 1920.] 
Gold, Silver, Copper, and Lead in South Dakota and Wyoming. 
[U.S. Geological Survey, Mineral Resources of the United States, 1017. 
Part I: 11. Washington, 1o19.| 
—Hess, F. L. Cobalt. [U.S. Geological Survey, Mineral Resources of the 
United States, 1916. Washington, roro.] 
Cobalt, Molybdenum, Nickel, Titanium, Tungsten, Radium, 
Uranium, and Vanadium in 1917. [U.S. Geological Survey, Mineral 
Resources of the United States, 1917. Part I: 29. Washington, 1920.] 
—Hit, J. M. Arsenic, Bismuth, Selenium, and Tellurium in 1o1g. [U.S. 
Geological Survey, Mineral Resources of the United States, ro19.° Part I: 
3. Washington, 1920.] 
Bauxite and Aluminum in 191g. [U.S. Geological Survey, Mineral 
Resources of the United States, 1919. Part I: 5. Washington, 1920.] 
—Ho.puHavus, Kart. Sobre alguns Lamellibranchios Fosseis do Sul do 
Brasil. [Monographias do Servico Geologico E Mineralogico do Brasil. 
Vol. II. Rio de Janeiro: Imprensa Nacional, 1918.] 
—Hopxins, O. B. Structure and Oil and Gas Resources of the Osage Reserva- 
tion, Oklahoma. T. 25 N., Rs. rr and 12 E. [U.S. Geological Survey, 
Bulletin 686-H. Washington, ror9.] 
—Jones, E. L. A Deposit of Manganese Ore in Wyoming. [U.S. Geological 
Survey, Bulletin 715-C. Washington, 1920.] 
Some Deposits of Manganese Ore in Colorado. [U.S. Geological 
Survey, Bulletin 715-D. Washington, 1920.] 
—Kartser, E. Bericht iiber geologische Studien wiahrend des Krieges in 
Siidwestafrika. [Abhandlungen der Giessener Hochschulgesellschaft, 
II. Verlag von Alfred Tépelmann in Giessen, 1920.] 
Der Eldolithsyenitlakkolith der Serra de Monchique im siidlichen 
Portugal. [Separat-Abdruck aus dem Neuen Jahrbuch fiir Mineralogie, 
Geologie und Paliontologie, Beilage-Band XXXIX (Festband Bauer), 
Seite 225-267. Stuttgart, 1914. E. Schweizerbart’sche Verlagsbuch- 
handlung. Ndagele and Dr. Sproesser.| 
Studien wahrend des Krieges in Siidwestafrika. [Sonder-Abdruck 
aus der Zeitschrift der deutschen Geologischen Gesellschaft, Band 72, 
Jahrgang 1920, Monatsbericht Nr. Bell 
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