134 THE UNITED STATES GEOLOGICAL SURVEY. [bull. 227. 
/// preparation: 
21. Geology and ore deposits of the Bisbee quadrangle, Arizona, by F. L. Ran- 
some. 
22. Forest conditions in the San Francisco Mountains Forest Reserve, Arizona, 
by J. B. Leiberg, T. F. Rixon, and A. Dodwell, with an introduction by 
F..G. Plummer. 
23. Forest conditions in the Black Mesa Forest Reserve, Arizona, prepared by 
F. G. Plummer, from notes by T. F. Rixon and Arthur Dodwell. 
24. Zinc and lead deposits of northern Arkansas, by G. I. Adams, assisted by 
A. H. Purdue and E. F. Burchard. 
25. Copper deposits of the Encampment quadrangle, Wyoming, by A. C. Spencer. 
26. Economic resources of the nothern Black Hills, by J. P. Irving, with chap- 
ters by S. F. Emmons and T. A. Jaggar, jr. 
27. Geological reconnaissance across the Bitterroot Range and the Clearwater 
Mountains in Montana and Idaho, by Waldemar Lindgren. 
28. The superior analyses of igneous rocks from Roth's Tabellen, 1869 to 1884, 
arranged according to the quantitative system of classification, by H. S. 
Washington. 
29. Forest conditions in the Absaroka division of the Yellowstone Forest Reserve, 
by J. B. Leiberg. 
30. Forest conditions in the Little Belt Mountains Forest Reserve and the Little 
Belt Mountains quadrangle, Montana, by J. B. Leiberg. 
31. Preliminary report on the geology of the Arbuckle and Wichita mountains, 
by J. A. Taff, with an appendix on reported ore deposits of the Wichita 
Mountains, by H. Foster Bain. 
— Darien lobe of the Lake Michigan glacier of the late Wisconsin stage of 
glaciation and associated phenomena, by W. C. Alden. 
— Geology and underground water resources of the Central Great Plains, by 
N. H. Darton. 
— The Triassic Cephalopod genera of America, by Alphus Hyatt and J. P. Smith. 
— The southern Appalachian forests, by H. B. Ayers and W. W. Ashe. 
— Forest conditions in the Lincoln Forest Reserve, New Mexico, by F. G. Plum- 
mer and M. G. Gowsell. 
