PKOFESSIONAL PAPERS. 
1. Preliminary report on the Ketchikan mining district, Alaska, with an introduc- 
tory sketch of the geology of southeastern Alaska, by A. H. Brooks. 1902. 
4°. 120 pp., 2 pis. 
2. Reconnaissance of the northwestern portion of Reward Peninsula, Alaska, by 
A.J.Collier. 1902. 4°. 70 pp., 11 pis. 
3. Geology and petrography of Crater Lake National Park, by .1. S. Diller and 
H. B. Patton. 1902. 4°. 167 pp., 19 pis. 
4. The forests of Oregon, by Henry Gannett. 1902. 4°. 36 pp., 7 pis. 
5. The forests of Washington, a revision of estimates, by Henry Gannett. 1902. 
4°. 38 pp., 1 pi. 
6. Forest conditions in the Cascade Range, Washington, between the Washington 
and Mount Rainier forest reserves, by F. G. Plummer. 1902. 4°. 42 pp. , 11 pis. 
7. Forest conditions in Olympic Forest Reserve, Washington, from notes by A. 
Dodwell and T. F. Rixon. 1902. 4°. 110 pp., 20 pis. 
8. Forest conditions in the northern Sierra Nevada, California, by J. B. Leiberg. 
1902. 4°. 194 pp., 12 pis. 
9. Forest conditions in Cascade Range Forest Reserve, by A. D. Langille, F. G. 
Plummer, A. Dodwell, T. F. Rixon, and J. B. Leiberg, with introduction by 
Henry Gannett. 1903. 4°. 298 pp., 41 pis. 
L0. Reconnaissance from Fort Hamlin to Kotzebuc Sound, Alaska, by way of Dall, 
Kanuti, Allen, and Kowak rivers, by W. C. Mendenhall. 1902. 4°. 68 pp., 
10 pis. 
11. Clays of the United States east of the Mississippi River, by Heinrich Ries. 1903. 
4°. 298 pp., 9 pis. 
L2. Geology of the Globe copper district, Arizona, by F. L. Ransome. 1903. 4°. 
168 pp., 27 pis. 
L3. Drainage modifications in southeastern Ohio and adjacent parts of West Virginia 
and Kentucky, by W. G. Tight. 1903. 4°. Ill pp., 17 pis. 
14. Chemical analyses of igneous rocks, published from 1884 to 1900, with a critical 
discussion of the character and use of analyses, by H. S. Washington. 1903. 
4°. 495 pp. 
15. Mineral resources of the Mount Wrangell district, Alaska, by W. C. Mendenhall 
and F. C. Schrader. 1903. 4°. 71 pp., 10 pis. 
L6. Carboniferous formations and faunas of Colorado, by G. H. Girty. 1903. 4°. 
546 pp., 10 pis. 
L7. Preliminary report on the geology and water resources of Nebraska west of the 
one hundred and third meridian, by N. H. Darton. 1903. 4°. 69 pp., 42 pis. 
8. Chemical composition of igneous rocks expressed by means of diagrams, with 
reference to rock classification on a quantitative chemico-mineralogical basis, 
by J. P. Iddings. 1903. 4°. 98 pp., 8 pis. 
19. Contributions to the geology of Washington, geology and physiography of Cen- 
tral Washington, by G. O. Smith; physiography and deformation of the 
Wenatchee- Chelan district, Cascade Range, by Bailey Willis. 1903. 4°. 
101pp., 7 pis. 
20. A reconnaissance in northern Alaska across the Rocky Mountains, along Koy ukuk, 
John, Anaktuvuk, and Colville rivers, and the Arctic coast to Cape Lisburne, 
in 1901, by F. C. Schrader, with notes by W. J. Peters. 1904. 4°. 139 pp., 
16 pis. 
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