publications: annual reports. 127 
Twentieth Annual Report of the IT. S. Geological Survey, etc. — Continued. 
Pt. IV. Hydrography, vii, 660 pp., 75 pis. 
Report of progress of steam measurements for calendar year 1898, by F. H. Newell, pp. 
1-562, pis. i-lxiii. 
Hydrography of Nicaragua, by A. P. Davis, pp. 563-637, pis. lxiv-lxxv. 
Index, pp. 639-660. 
Pt. V. Forest reserves, xix, 498 pp., 159 pis. (8 maps in separate case). 
The forests of the United States, by Henry Gannett, pp. 1-37, pis. i-vii. 
Pikes Peak, Plum Creek, and South Platte reserves, by J. G. Jack, pp. 39-115, pis. viii- 
xlvii. 
White River Plateau Timber Land Reserve, by G. B. Sudworth, pp. 117-179, pis. xlviii- 
iviii. 
Battlement Mesa Forest Reserve, by G. B. Sudworth, pp. 181-243, pis. lix-lxxv. 
Flathead Forest Reserve, by H. B. Ayres, pp. 245-316, pis. lxxvi-cxiii. 
Bitterroot Forest Reserve, by J. B. Lciberg, pp. 317-409, pis. cxiv-cxlii. 
San Gabriel Forest Reserve, by J. B. Leiberg, pp. 411-428, pis. cxliii-cxlvi. 
San Bernardino Forest Reserve, by J. B. Leiberg, pp. 429-454, pis. cxlvii-cliii. 
San Jacinto Forest Reserve, by J. B. Leiberg, pp. 455-478, pis. cliv-clix. 
Index, pp. 479-498. 
Pt. VI. Mineral resources of the United States, 1898: Metallic produets, coal and coke, viii, 
616 pp. 
PI. VI. (Continued). Mineral resources of the United States, 1898: Nonmetallie products, except 
coal and coke, xi, 804 pp., 1 pi. 
Pt. VII. Explorations in Alaska in 1898, v, 509 pp., 38 pis., 25 maps. 
Reconnaissance in Sushitna Basin and adjacent territory, Alaska, in L898, by <i. H. 
Eldridge, pp. 1-29, pis. i-vi, maps 1-3. 
Reconnaissance in southwestern Alaska in 1898, by J. E. Spurr, pp. 31-264, pis. vii-xiii, 
maps 4-14. 
Reconnaissance from Resurrection Bay to Tanana River, Alaska, in 1898, by W. C. 
Mendenhall, pp. 265-310, pis. xiv-xxi, maps 15-17. 
Reconnaissance of a part of Prince William Sound and the Copper River district, Alaska, 
in 1898, by F. C. Schrader, pp. 341-423, pis. xxii-xxxv, maps 18-21. 
Reconnaissance in the Tanana and White river basins, Alaska, in 1898, by A. H. Brooks, 
pp. 425-494, pis. xxxvi-xxxviii, maps 22-25. 
Index, pp. 495-509. 
Twenty-first Annual Report of the United States Geological Survey, 1899-1900, 
Charles D. Walcott, Director. 1900. (Parts III, IV, VI, VI continued, and VII, 
1901.) 8°. 7 pts. in 8 vols, and separate case for maps with Pt. V. 
Pt. I. Director's report, including triangulation, and primary traverse, and spirit leveling, 
608 pi>., 3 pis. 
Report of the Director, pp. 11-204, pis. i-iii. 
Triangulation, primary traverse, and spirit leveling, by H. M.Wilson, J. H.Renshawe, 
E. M. Douglas, and R. U. Goode, pp. 205-582. 
Index, pp. 5S3-608. 
Pt. II. General geology, economic geology, Alaska, 522 pp., 68 pis. 
Geology of Rico Mountains, Colorado, by Whitman Cross and A. ('. Spencer, pp. 7-165, 
pis. i-xxii. 
Glacial sculpture of Bighorn Mountains, Wyoming, by F. E. Matthcs, pp. 167-J90, pi. xxiii. 
The Esmeralda formation, a fresh-water lake deposit, by W, H. Turner, with a descrip- 
tion of the fossil plants by F. H. Knowlton, and of a fossil fish by F. A. Lucas, pp. 191- 
226, pis. xxiv-xxxi. 
Mineral-vein formation at Boulder Hot Springs, Montana, by W. H. Weed, pp. 227-255, 
pis. xxxii-xxxiv. 
Geology of eastern Choctaw coal field, Indian Territory, by J. A. Taff and G. I. Adams, 
pp. 257-311, pis. xxxv-xxxvii. 
Preliminary report on Camden coal field of southwestern Arkansas, by .1. A. Taff, pp. 
313-329, pis. xxxviii, xxxix. 
Reconnaissance from Pyramid Harbor to Eagle City, Alaska, including a, description 
of the copper deposits of the Upper White and Tanana rivers, by A. H. Brooks, pp. 
331-391, pis. xl-1. 
Reconnaissance of Chitina River and Skolai Mountains, Alaska, by Oscar Rohn, pp. 
393-440, pis. li-lix. 
Preliminary report on a reconnaissance along Chandlar and Koyukuk rivers, Alaska, 
in 1899, by F. C. Schrader, pp. 441-486, pis. lx-lxviii. 
Alaskan geographic names, by Marcus Baker, pp. 487-509. 
Index, pp. 511-522. 
