122 THE UNITED STATES GEOLOGICAL SURVEY. [bull. 227. 
Tenth Annual Report of the United States Geological Survey, 1888-89, J. W. Powell, 
Director. 1890. 8°. 2 pt, (Out of stock.) 
J't. I. Geology, xv, 774 pp., 98 pis. 
Report of the Director, pp. 1-80, pis. i-v. 
Administrative reports of chiefs of divisions, pp. 81-252. 
General account of the fresh- water- morasses of the United States, with a description of 
the Dismal Swamp district of Virginia and North Carolina, by N. S. Shaler, pp. 255-339, 
pis. vi-xix. 
The Penokee iron-bearing series of Michigan and Wisconsin, by K. 1). Irving and C. R. 
Van Hise, pp. 341-507, pis. xx-xlii. 
Fauna of the Lower Cambrian or Olenellus zone, by (I. D. Walcott, pp. 509-763, pis. xliii- 
xcviii. 
Index, pp. 765-774. 
Pt. II. Irrigation, viii, 123 pp. 
Eleventh Annual Report of the United States Geological Survey, 1 889-90, J.W. Powell, 
Director. 1891. 8°. 2 pt. (Out of stock.) 
Pt. I. Geology, xv, 757 pp., 66 pis. 
Report of the Director, pp. 1-30, pi. i. 
Administrative reports of chiefs of divisions, pp. 31-185. 
Pleistocene history of northeastern Iowa, by W J McGee, pp. 189-577, pis. ii-lxi. 
Natural gas field of Indiana, by A. J. Phinney, with an introduction by W J McGee] 
pp. 579-742, pis. lxii-lxvi. 
Index, pp. 743-757. 
Pt. II. Irrigation, xiv, 395 pp., 30 pis. and maps. 
Hydrography, pp. 1-110, pi. lxvii-xcvi. 
'Engineering, pp. 111-200. 
The arid lands, pp. 201-289. 
Topography, pp. 291-343. 
Irrigation literature, pp. 345-388. 
Index, pp. 389-395. 
Twelfth Annual Report of the United States Geological Survey, 1890-91, J. W. 
Powell, Director. 1891. 8°. 2 pt. (Out of stock.) 
Pt. I. Geology, xiii, 675 pp., 53 pis. 
Report of the Director, pp. 1-19, pi. i. 
Administrative reports of chiefs of divisions, pp. 21-210. 
Origin and nature of soils, by N. S. Shaler, pp. 213-345, pis. ii-xxxi. 
The Lafayette formation, by W J McGee, pp. 347-521, pis. xxxii-xli. 
The North American continent during Cambrian time, by ('. D. Walcott, pp. 523-568, 
xlii-xlv. 
Eruptive rocks of Electric Peak and Sepulchre Mountain, Yellowstone National Park, 
by J. P. Iddings, pp. 569-664, pis. xlvi-liii. 
Index, pp. 665-675. 
Pt. II. Irrigation, xviii, 576 pp., 93 pis. 
Location and survey of reservoir sites, by A. H. Thompson, pp. 1-212, pis. liv-lvii. 
Hydrography of the arid regions, by F. H. Newell, pp. 213-361, pis. lviii-cvi. 
Irrigation in India, by H. M. Wilson, pp. 363-561, pis. cvii-cxlvi. 
Financial statement, pp. 562-568. 
Index, pp. 569-576. 
Thirteenth Annual Report of the United States Geological Survey, 1891-92, J. W 
Powell, Director. 1892. [Pts. II and III, 1893.] 8°. 3 pt. (Out of stock.) 
PI. I. Director's report and report of chiefs of divisions, vii, 210 pp., 2 pi. 
Report of the Director, pp. i-vii, 1-66, pis. i-ii. 
Administrative reports of chiefs of divisions, pp. 67-235. 
Index, pp. 237-240. 
Pt. II. Geology, x, 372 pp., 105 pis. 
Second expedition to Mount St. Elias, by I. C. Russell, pp. 1-91, pis. iii-xxi. 
Geological history of harbors, by N. S. Shaler, pp. 93-209, pis. xxii-xlv. 
Mechanics of Appalachian structure, by Bailey Willis, pp. 211-281, pis. xlvi-xcvi. 
Average elevation of the United States, by Henry Gannett, pp. 283-289, pi. cvii. 
The Rensselaer grit plateau in New York, by T. N. Dale, pp. 291-340, pis. xcvii-ci. 
American Tertiary Aphidse, by S. 11. Scudder, pp. 341-366, pis. cii-cvi. 
Index, pp. 367-372. 
