138 CLASSIFIED KEY TO THE INDEX. [bull. 271 
Page 
Economic geology — Continued. 
Montana 15 
Nebraska 15 
Nevada 15 
New Jersey 15 
New Mexico 15 
New York 15 
North Carolina 15 
Nort 1 1 1 >akota 15 
Ohio 15 
Oklahoma 15 j 
Oregon 1 5 I 
Pennsylvania 15 ' 
South Carolina 15 
S< »uth Dakota 15 
Tennessee 15 
Texas 15 
Utah 15 
Vermont 15 
Washington 15 I 
West Indies 15 
West Virginia 15 
Wisconsin 15 
Wyoming 15 
< reneral 15 
Economic products described It 
Florida 1 ( 
Geologic formations described It 
Geologic ma] >s 1 1 
Georgia 1 ' 
Glacial ge< >logy 1 ' 
Alaska 1 ' '■ 
Appalachian region 1' 
Canada 1' 
Great Lakes region 1- 
Greal Plains region 1 
Mississippi Valley region 1 
New England and New York 1 
Ohio Valley region 1 
Pacific coast region 1 
Rocky Mountain region 1 
General 1 
Greenland 1 
Guatemala 1 
Hawaiian Islands 1 
Hydrology 1 
A ppalachian region 1 
Atlantic coast region 1 
< 1 reat Basin region 1 
Great Lakes region 1 
Great Plains region 1 
Gulf region 1 
Lake Superior region . - 1 
