﻿— 536 — 



U. S. geological survey. 



A report on the economic geology of the Silverton quadrangle Co- 

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U. S. geological survey. 



A synopsis of American fossil bryozoa, including bibliography and 

 sinonimy. by John M. Nickles and Ray S. Bassler. — Washington, 1900. 

 -S. 288. 



U. S. geological survey. 



Bibliography and catalogue of the fossil vertebrata of North Ame- 

 rica, by Oliver Perry Hay. — Washington, 1902. — S. 294. 



U. S. geological SU) vey. 



Bibliography and índex of North American Geology, paleontology. 

 petrology and mineralogy for theyear 1899, byFred. Bougton Weeks, 

 — Washington, 1900. — S. 287. 



U. S. geological survey. 



Bibliography of North American geology, paleontology, petrology 

 and mineralogy for the years 1892-1900 inclusive, byFred. Bougthon 

 Weeks. — Washington, 1802. — S. 155. 



U. S. geological survey. 



Boundaries of the U. S. and of the several States and Territories 

 with an outline of the Listory of all important charges of territory by 

 Henry Gannett. — W'ashington, 1900. — S. 286. 



U. S. geological survey. 



Bulletin N.o 163. — Flora of the Montana fórmation by Frank Hall 

 Knowlton. — Washington, 1900. — S. 278. 



U. S' geological survey. 



Bulletin N.*^ 164. — Reconnaissance in the Rid Grande coal fields oi 

 Texas by Thomas Wayland Vaughan: including a report on igneous 

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