190 PHYSICAL GEOLOGY 



GILBERT : Land Sculpture, in Geology of the Henry Mountains, 



pp. 99-150 ; U.S. Geog. and Geol. Surv., Rocky Mtn. Region. 



(Washington, 1877.) 

 Niagara Falls and their History, in Physiography of the United 



States, pp. 203-236. (New York, 1895.) 

 GOODE : The Piracy of the Yellowstone, in Jour, of Geol., Vol. VII, 



pp. 261-271. 

 HAYES : The Southern Appalachians, in Physiography of the United 



States, pp. 305-336. (New York, 1895.) 

 Physiography of the Chattanooga District, in 19th Ann. Rept., 



U.S. Geol. Surv., Pt. II, pp. 1-58. 

 JEFFERSON : Limiting Width of Meander Belts, in Nat. Geog. Mag., 



Vol. XIII, pp. 373-384. 

 JOHNSON, L. C. : The Nita Crevasse, in Bull. Geol. Soc. of Am., 



Vol. II, pp. 20-25. 



POWELL : Exploration of the Colorado River of the West and its Tribu- 

 taries. (Washington, 1875.) 



RUSSELL: Rivers of North America. (New York, 1898.) 

 SALISBURY : The Physical Geography of New Jersey ; N.J. Geol. 



Surv., Vol. IV, pp. 65-154. 

 SALISBURY and ATWOOD : The Geography of the Region about Devil's 



Lake and the Dalles of the Wisconsin; Wis. Geol. and Nat. 



Hist. Surv., Bull. No. V, Chs. Ill, IV. 

 SHALER : Rivers and Valleys, in Aspects of the Earth, pp. 143-196. 



(New York, 1889.) 

 WALCOTT : The Natural Bridge of Virginia, in Nat. Geog. Mag., 



Vol. V, pp. 59-62. 

 WILLIS : The Northern Appalachians, in Physiography of the 



United States, pp. 169-202. (New York, 1895.) 



