CLASSIFIED KEY TO THE INDEX. 99 
Economic geology — Continued. Page . 
Arizona [10 
Arkansas 110 
California 110 
Canada 110 
Colorado 110 
District of Columbia 11 
Georgia 11 
Idaho 11 
Illinois 11 
Indiana 11 
Indian Territory 11 
Iowa 11 
Kansas 11 
Kentucky 11 
Mexico 11 
Michigan 11 
Minnesota 11 
Missouri 11 
Montana 11 
Nebraska 11 
Nevada 11 
New Jersey 11 
New Mexico 11 
New York 11 
North Carolina 11 
North Dakota 11 
Oklahoma 11 
Oregon „ 11 
Philippine Islands 11 
South Carolina 11 
South Dakota 11 
Tennessee 112 
Texas 112 
Utah 112 
Vermont 112 
Virginia 112 
Washington 112 
West Indies 112 
West Virginia 112 
Wisconsin 112 
Wyoming 112 
General 112 
Economic products described 112 
Geologic formations, description and synonymy .' 1 1 5 
Geologic maps 119 
Georgia 119 
Glacial geology 120 
Alaska 120 
Appalachian region 120 
Canada 1 20 
Great Basin region 120 
Great Lakes region 1 20 
Mississippi Valley region 1 20 
New England and New York 120 
