II ADVERTISEMENT. 
B 200. Reconnaissance of the borax deposits of Death Valley and Mohave Desert, by M. R. Campbell. 
1902. 23 pp., 1 pi. 
B 202. Tests for gold and silver in shales from western Kansas, by Waldemar Lindgren. 1902. 21 pp. 
PP 2. Reconnaissance of the northwestern portion of Seward Peninsula, Alaska, by A. J. Collier. 
1902. 70 pp., 11 pis. 
PP 10. Reconnaissance from Fort Hamlin to Kotzebue Sound, Alaska, by way of Dall, Kanuti, Allen, 
and Kowak rivers, by W. C. Mendenhall. 1902. 68 pp., 10 pis. 
PP 11. Clays of the United States east of the Mississippi River, by Heinrich Ries. 1903. 298 pp., 9 pis. 
PP 12. Geology of the Globe copper district, Arizona, by F. L. Ransome. 1903. 168 pp., 27 pis. 
B 212. Oil fields of the Texas-Louisiana Gulf Coastal Plain, by C. W. Hayes and William Kennedy. 
1903. 174 pp., 11 pis. 
B 213. Contributions to economic geology, 1902; S. F. Emmons, C. W. Hayes, geologists in charge. 
1903. 449 pp. 
PP 15. The mineral resources of the Mount Wrangell district, Alaska, by W. C. Mendenhall and 
F. C. Schrader. 1903. 71 pp., 10 pis. 
B 218. Coal resources of the Yukon, Alaska, by A. J. Collier. 1903. 71 pp., 6 pis. 
B 219. The ore deposits of Tonopah, Nevada (preliminary report), by J. E. Spurr. 1903. 31 pp., 1 pi. 
PP 20. A reconnaissance in northern Alaska, in 1901, by F. C. Schrader. 1904. 139 pp., 16 pis. 
PP 21. Geology and ore deposits of the Bisbee quadrangle, Arizona, by F. L. Ransome. 1904. 168 pp., 
29 pis. 
B 223. Gypsum deposits of the United States, by G. I. Adams and others. 1904. 129 pp., 21 pis. 
PP 24. Zinc and lead deposits of northern Arkansas, by G. I. Adams. 1904. 118 pp., 27 pis. 
PP 25. Copper deposits of the Encampment district, Wyoming, by A. C. Spencer. 1904. 107 pp., 2 pis. 
B 225. Contributions to economic geology, 1903; S. F. Emmons, C. W. Hayes, geologists in charge. 
1904. 527 pp., 1 pi. 
PP 26. Economic resources of the northern Black Hills, by J. D. Irving, with contributions by S. F. 
Emmons and T. A. Jaggar, jr. 1904. 222 pp., 20 pis. 
PP 27. A geological reconnaissance across the Bitterroot Range and Clearwater Mountains in Mon- 
tana and Idaho, by Waldemar Lindgren. 1904. 123 pp., 15 pis. 
B 229. Tin deposits of the York region, Alaska, by A. J. Collier. 1904. 61 pp., 7 pis. 
B 236. The Porcupine placer district, Alaska, by C. W. Wright. 1904. 35 pp., 10 pis. 
B 238. Economic geology of the Iola quadrangle, Kansas, by G. I. Adams, Erasmus Haworth, and 
W. R. Crane. 1904. 83 pp., 11 pis. 
B 243. Cement materials and industry of the United States, by E. C. Eckel. 1905. 395 pp., 15 pis. 
B 246. Zinc and lead deposits of northwestern Illinois, by H. Foster Bain. 1904. 56 pp., 5 pis. 
B 247. The Fairhaven gold placers, Seward Peninsula, Alaska, by F. H. Moffit. 1905. 85 pp., 14 pis. 
B 249. Limestones of southeastern Pennsylvania, by F. G. Clapp. 1905. 52 pp., 7 pis. 
B 250. The petroleum fields of the Pacific coast of Alaska, with an account of the Bering River coal 
deposits, by G. C. Martin. 1905. 64 pp., 7 pis. 
B 251. The gold placers of the Fortymile, Birch Creek, and Fairbanks regions, Alaska, by L. M. Prindle. 
1905. 89 pp., 16 pis. 
WS 117. The lignite of North Dakota and its relation to irrigation, by F. A. Wilder. 1905. 59 pp., 8 pis. . 
PP 36. The lead, zinc, and fluorspar deposits of western Kentucky, by E. O. Ulrich and W. S. T. Smith. 
1905. 218 pp., 15 pis. 
PP 38. Economic geology of the Bingham mining district of Utah, by J. M. Boutwell, with a chapter 
on areal geology, by Arthur Keith, and an introduction on general geology, by S. F. Emmons. 
1905. 413 pp., 49 pis. 
PP41 Thegeology olthecentral Copper River region, Alaska, by W.C. Mendenhall. 1905. — pp., — pis. 
B 254. Report of progress in the geological resurvey of the Cripple Creek district, Colorado, by Walde- 
mar Lindgren and F. L. Ransome. 1904. 36 pp. 
B 255. The fluorspar deposits of southern Illinois, by H. Foster Bain. 1905. 75 pp., 6 pis. 
B 256. Mineral resources of the Elders Ridge quadrangle, Pennsylvania, by R. W. Stone. 1905. 
— pp., 12 pis. 
B 259. Report on progress of investigations of mineral resources of Alaska, in 1904, by A. H. Brooks 
and others. 1905. 196 pp., 3 pis. 
B 260. Contributions to economic geology, 1904; S. F. Emmons, C. W. Hayes, geologists in charge. 
1905. 620 pp., 4 pis. 
B 261. Preliminary 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. 1905. 172 pp. 
B263. Methods and costs of gravel andplacerminingin Alaska, byC. W. Purington. 1905. 273pp., 42pls. 
Correspondence should be addressed to 
The Director, 
United States Geological Survey, 
Washington, D. C. 
June, 1905. 
