418 Scientific Intelligence. 



No. 430. Coiitiibutions to Economic, Geology (Short Papers 

 and Preliminary Reports), in09. Several advance cliapters have 

 been issued, viz., A, on Gold and Silver ; C, Lead and Zinc; D, 

 Hare jNletals ; F. Structural Materials ; G, Mineral Paints ; II, 

 Phosphate ; J, Miscellaneous Nonmetallic Products ; I, Saliness. 



No. 432. Some Ore Deposits in Maine and the Milan Mine, 

 New Hampshire; by William II. Emmons. Pp. 62, with ;5 plates 

 and 23 tigures. 



No. 434. Hesults of Spirit Leveling in Delaware, District of 

 Columbia, Mar3'land, and Virginia, 1896 to 1909, indusive. R. B. 

 Marshall, chief geographer. Work done in cooperation with 

 the State of Maryland during the entire jjeriod, and with the 

 State of Virginia in part of 1908. Pp. 74. 



No. 435. A Reconnaissance of Parts of New Mexico and 

 Northern Arizona ; by N. H. Darton. Pp. 88, with 17 plates 

 and 8 figures. ' 



No. 437. Results of Spirit Leveling in Maine, New Hampshire, 

 and Vermont, 1896 to 1909, inclusive. R. H. Marshall, chief 

 geographer. Work done in cooperation with the State of Maine, 

 during 1899, inclusive. Pp. 59. 



No. 442-A. The Mining Industry in 1909, and Alaska Coal 

 and its Utilization ; hj Alfred H. Brooks. Advance chapter, 

 pp. 1-84. 



No. 444. Bibliography of North American Geology for 1909, 

 with Subject Index ; by John M. Nickles. Pp. 174. 



Water Supply Papers. — No. 237. The quality of the Surface 

 Waters of California ; by Walton tan Winkle and Febderiok 

 M. Eaton. Pp. 142 with one plate. 



No. 240. Geology and Water Resources of the San Luis 

 Valley, Colorado; by C. E. Siebenthal. Pp. 128, with 13 

 plates and 15 figures. 



Nos. 246, 247, 249, 250, 251. Surface Water Supply of the 

 United States 1907-8. Prepared under the Direction of M. O. 

 Leighton. — No. 246. Part VI. Missouri River Basin ; by Rob- 

 ert FoLLANSBEE and J. E. Stewart. Pp. 311, with 13 plates 

 and 2 figures. — No. 247. Part VII. Lower Mississippi Basin ; 

 by W. B. Freeman, W. A. Lamb, and R. H. Bolster. Pp. 124, 

 vs^ith 2 plates and 2 figures. — No. 249. Part IX. Colorado River 

 Basin ; by W. B. Freeman and R. H. Bolster. Pp. 206, with 

 10 plates.— No. 250. Part X. The Great Basin ; by E. C. La 

 Rue and F. F. Henshaw. Pp. 151, with 7 plates and one figure. 

 —No. 251. Part XI. California ; by W^. B. Clapp and W. F. 

 Martin. Pp. 363, with 7 plates and one figure. 



No. 253. Water Power of the Cascade Range. Part I. 

 Southern Washington ; by John C. Stevens. Prepared in coop- 

 eration with the State of Washington. Pp. 94, with 21 plates 

 and 3 figures. 



No. 255. Underground Waters for Farm Use ; by Myron L. 

 Fuller. Pp. 58, with 17 plates and 27 figures. 



No. 260. Preliminary Report of the Ground Water of Estan- 

 cia Valley, New Mexico ; by Oscar E. Meinzer. Pp. 33. 



