1
2
Foilsithe: 1994
Superior document: A history of the Water Resources Branch, U. S. Geological Survey 1
3
Foilsithe: 1929-1971
4
Údair Eile:
“...United States Geological Survey...”
5
Foilsithe: April,, 1953
6
Údair Eile:
“...United States Geological Survey...”
7
Údair Eile:
“...United States Geological Survey...”
8
Foilsithe: 1932-1993
9
Foilsithe: 1887-1973
10
11
Foilsithe: 2007
Superior document: U. S. Geological Survey professional paper 1703
12
Foilsithe: 1989
13
Foilsithe: 1883-1934
14
Foilsithe: 1900
15
Foilsithe: 1990
Superior document: A history of the Water Resources Division, US Geological Survey 5
16
“...United States Geological Survey...”
17
“...United States Geological Survey...”
18
“...United States Geological Survey...”
19
“...United States Geological Survey...”
20
“...United States Geological Survey...”
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