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Hydrographic surveying
207
Rivers, creeks, streams, etc
202
Navigation improvements
199
Cost
159
Channels (Hydraulic engineering)
131
Dredging
76
Flood control
68
United States. War Department
64
Geological surveys
63
Military bases and posts
62
Water and water supply
62
United States. Army
61
Geology
60
Mines and mineral resources
59
Financial statements
58
Surveying
54
Watersheds
53
Irrigation
51
United States
51
Harbors and ports
50
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