288 PHYSICAL GEOLOGY 



RUSSELL : A Geological Reconnaissance in Southern Oregon, in 4th 



Ann. Kept., U.S. Geol. Surv., pp. 431-464. 

 TARR : Physical Geography of New York State, Chs. II, III. (New 



York, 1902.) 

 WILLIS : The Mechanics of Appalachian Structure, in 13th Ann. 



Kept., U.S. Geol. Surv., Pt. II, pp. 211-283. 

 Folios of U.S. Geol. Surv. of areas in mountainous districts. 



A number of the references under other headings, especially 

 "The Work of Streams" and "The Composition of the Earth," are 

 serviceable also here. 



