■ihuv less important ilWFFrTw niappeu on a scan 
L or about 2 miles to an inch, ami cover areas measu i'¬ 
ll' in latitude and longitude. Ku mmais'-um-e maps oi 
or sparsely inhabited regions have been made uiua sealt 
or about 4 miles to an inch, covering areas measuring 
[latitude and longitude. Maps for special purposes art 
pn scales larger than 
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•pographic survey of Alaska has been in progress since 
land nearly 35 per cent of its area lias now been mapped. 
10 per cent of the Territory has been covered by reoon- 
|ice maps on a scale of or about 10 miles to an 
Most of the remaining area surveyed in Alaska has 
[napped on a scale of but about 3,500 square miles 
len mapped on a scale of 
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large part of the Hawaiian Islands has been surveyed, 
|e resulting maps are published on a scale of 
features shown on these maps may be arranged in three 
—(1) water, including seas, lakes, rivers, canals, swamps, 
|ther bodies of water; (2) relief, including mountains, 
alleys, and other features of the land surface; (3) culture 
of man), such as towns, cities, roads, railroads, and 
fades. The conventional signs used to represent these 
3 are shown mid explained below. Variations appear on 
burlier maps, and additional features are represented on 
pedal maps. 
S SO - 
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e man are printed the names of adjoining ■ pi aura ogled 
dch maps have been published. Over 2,800 quadrangles 
e United States have been surveyed, and maps of thJ 
nilm- to the one on the other side of this sheet have bel 
iblished. 
The topographic map is the base on which the geology aj 
literal resources of a quadrangle are represented, and 
ips showing these features are bound together with a desci 
e ! i to form a folio of the Geologic Atlas of the Unit) 
it6s. |1|V ' I 
Index maps of each State showing the topographic maps a.i 
ologic folios published by the United States Geological Svl 
y may be obtained free. Copies of the topographic mal 
ly be obtained for 10 cents each, or in lots of 50 or mol 
her of the same or of different quadrangles, for 6 cents ear) 
te geologic folios are sold for 25 cents or more each, the pr 
pending on the size of the folio. A circular describing t| 
ios will be sent on request. 
Applications for maps or folios should be accompanied 1 
h, draft, or money order (not postage stamps) and should 
Iressed to 4 
P T THE DIRECTOR, 
United Stales Geological Survey, 
Washington, D. 
November, 1019. 
