II ADVERTISEMENT. 
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 \V. 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. 1901. 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-Colorado, by A. C. Spencer. 1904. 
107 pp., 2 pis. 
B 225. Contributions to economic geology, 1903; S. F. Emmons, C. VY. 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. — pp., 20 pis. 
PP 27. A geological reconnaissance across the Bitterroot Range and Clearwater Mountains in Montana 
and Idaho, by Waldemar Lindgren. 1904. — pp., 15 pis. 
Correspondence should be addressed to 
The Director, 
United States Geological Sukvey, 
Washington, D. C. 
June, 1904. 
