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on a scale 
nausmaiiv less important districts are 
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of or about 2 miles to an inch, and cover areas measur- 
ing 30 in latitude and longitude. Kecpnnaissance maps of 
desert or sparsely inhabited regions have been made on a scale 
of Wnsk or about 4 miles to an inch, covering areas measuring 
[HjHHHH Maps for special | purposes | are 
made on. scales larger than ~bq. 
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1° in latitude and lon^it 
topogn 
urvey of Alaska has been in progress since 
898, and nearly 35 per cent of its area has now been mapped. 
(0 per cent of the Territory has been covered bv recon- 
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naissance maps on a scale of 62 ^, or about 10 miles to an 
inch. Most of the remaining area surveyed in Alaska has 
been mapped on a scale of but about 3,500 square miles 
has been mapped on a scale of 
A large part of the Hawaiian Islands has been surveyed, 
ami the resulting maps are published on a scale of g—g. 
The features shown on these maps may be arranged in three 
groups — (1) water, including seas, lakes, rivers, canals, swamps, 
and other bodies of water; (2) relief, including mountains, 
hills, valleys, and other features of the land surface; (3) culture 
(works of man), such as towns, cities, roads, railroads, and 
boundaries. The conventional signs used to represent these 
features are shown arid explained below. Variations appear on 
some earlier maps, and additional features are represented on 
some special maps. 
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