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The aerial camera is now being used in mapping. From t 11 
information recorded on the photographs, planimetric map 
which show only drainage and culture, have been made for sor 
areas in the United States. By the use of stereoscopic plottiij 
apparatus, aerial photographs are utilized also in the making 
the regular topographic maps, which show relief as well 
drainage and culture. 
A topographic survey of Alaska has been in progress sin] 
1898, and nearly 44 percent of its area lias now been mappi 
About 15 percent of the Territory has been covered by ma 
On a scale of (1 inch =' nearly 8 miles). For most of tj 
remainder of the area surveyed the maps published *are onj 
scale of (1 inch — nearly 4 miles). For some areas of p 
ticular economic importance, covering about 4,300 square mill 
the maps published are on a scale of (1 inch — nearly 1 mi] 
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