BIBLIOGRAPHY OF NORTH AM KIM (AX GEOLOGY, 1906-1901 185 
Ulrich, Edward Oscar, and Bassler, Ray S. 
2412. New American Paleozoic Ostracoda. Notes and descriptions of upper 
Carboniferous genera and species. — U. S. Nat. Mus., Proc, vol. 30, pp. 149-164, 1 
p!., 1900. 
Underhill, B. M. 
2413. The evolution of the horse. — Delaware County Institute of Science, 
vol. 2, no. 4, pp. 115-127, 2 figs., July, 1907; Sci. Am. Suppl., vol. 04, pp. 412-414, 
5 figs., December 28, 1907. 
Underhill, James. 
2414. Area! geology of the lower Clear Creek (Colorado). — Colorado Univ., 
Studies, vol. :i no. 4, pp. 203-376, 5 figs.. 1906; Colorado Sci. Soc, Proc. vol. 8, 
pp. 103-122, 5 figs., 1900. 
Describes the topography, the general geology, and the occurrence, characters, and 
relations of the metamorphosed igneous rocks occupying the area. 
Upham, Warren. 
2415. Quaternary history of the upper Mississippi Valley. — Abstract: Geol. 
Soc. America, Bull., vol. 17, pp. 725-72(5, 1907. 
U. S. Department of Agriculture, Bureau of Soils. 
2416. Soil survey field book. Field season, 1900. 319 pp. 
Contains a classification of soils. 
Field operations of the Bureau of Soils.— Sec Whitney, nos. 2570, 2571. 
U. S. Geological Survey. 
2417. The San Francisco earthquake and fire of April 18, 1906, and their 
effects on structures and structural materials. — U. S. Geol. Survey, Bull. no. 
324, 170 pp., 57 pis., 2 figs., 1907. 
Contains the following papers : 
Preface, by Joseph A. Holmes, pp. xi-xii. 
The earthquake as a natural phenomenon, by G. K. Gilbert, pp. 1-13. 
The effects of the earthquake and fire on various structures and structural materials, by 
Richard L. Humphrey, pp. 14-61. 
The effects of the earthquake and fire on buildings, engineering structures, and structural 
materials, by John S. Sewell, pp. 62-130. 
The earthquake and fire and their effects on structural steel and steel-frame buildings, 
by Frank Soule, pp. 131-158. 
List of papers relating to the earthquake and fire, pp. 159-161. 
2418. Mineral resources of the United States, calendar year 1905, 1403 pp., 
1906. 
Contains the following papers, largely statistical in character, relating to the produc- 
tion, condition of the industry, etc., but also in some cases containing notes on the 
geology and occurrence of the products treated : 
Mineral products of the United States in 1004 and 1905, pp. 23-41. 
Value, by States, of mineral products in 1005, by Wm. Taylor Thorn, pp. 42-52. 
(Metals.) 
Antimony, by C. C. Schnatterbeck, pp. 435-439. 
Bismuth, by C. C. Schnatterbeck, pp. 441-443. 
Copper, by Charles Kirchhoff, pp. 343-362. 
Gold and silver, by Waldemar Lindgren and others, pp. 113-341. 
Production in the United States, by Waldemar Lindgren, pp. 113-127. 
Alaska, by Alfred II. Brooks, pp. 127-134. 
Arizona, by v. C. Heikes, pp. 134-162. 
California, by Charles G. Vale. pp. 102 1S5. 
Colorado, by Waldemar Lindgren, pp. 185-214. 
Idaho, by V. C. Heikes, pp. 214-242. 
Montana, by Alexander X. Winched, pp. 2-12 259. 
Nevada, by Charles <;. Yale, pp. 2.VJ-275. 
