SERIES LIST. Ill 
B 260. Contributions to economic geology, 1904; S. F. Emmons and C. W. Hayes, geologists in charge. 
1905. 020 pp., 4 pis. 
B 261. Preliminary re ort on the operations of the coal-testing plant of the United States Geological 
Survey at the Louisiana Purchase Exposition, St. Louis, Mo., 1904; E. W. Parker, J. A. 
Holmes, and M. R. Campbell, comnrttee in charge. 1905. 172 pp. (Out of stock.) 
B 263. Methods and cost of gravel and placer mining in Alaska, by C. W. Purington. 1905. 273 pp., 
42 pis. 
PP 42. Geology of the Tonopah mining district, Nevada, by J. E. Spurr. 1905. 295 pp., 24 pis. 
PP 43. The copper deposits of the Clifton-Morenci district, Arizona, by Waldemar Lindgren. 1905. 
375 pp., 25 pis. 
B264. Record of deep-well drilling for 1904, by M. L. Fuller, E. F. Lines, and A. C. Veatch. 1905. 
106 pp. 
B 265. Geology of the Boulder district, Colorado, by N. M. Fenneman. 1905. 101 pp., 5 pis. 
B 267. The copper deposits of Missouri, by H. Foster Bain and E. O. Ulrich. 1905. 52 pp., 1 pi. 
B 269. Corundum and its occurrence and distribution in the United States (a revised and enlarged 
edition of Bulletin No. 180), by J. H. Pratt, 1906. 175 pp., 18 pis. 
PP 48. Report on the operations of the coal-testing plant of the United States Geological survey at 
the Louisiana Purchase Exposition, St. Louis, Mo., 1904; E. W. Parker, J. A. Holmes, M. R. 
Campbell, committee in charge. 1906. (In 3 parts.) 1492 pp., 13 pis. 
B 275. Slate deposits and slate industry of the United States, by T. N. Dale, with sections by E. C. 
Eckel, W. F. Hillebrand, and A. T. Coons. 1906. 154 pp., 25 pis. 
Correspondence should be addressed to 
The Director, 
United States Geological Survey, 
June, 1906. Washington, D. C. 
o 
