Publisher
Washington US Geological Survey 1914
34
Washington US Geological Survey 1919
26
Washington US Geological Survey 1918
20
Washington US Geological Survey 1897
11
Washington US Geological Survey 1899
10
Washington US Geological Survey 1915
7
US geogological survey
4
National Observatory
3
Washington US Geologocal Survey 1899
2
N.A
1
Washington US Geogological Survey 1914
1
Washington US Geographical Survey 1904
1
Washington US Geological Survey
1
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