Publisher
US geogological survey
202
Office of the Trigonometrical Branch, Survey of India
52
G.T. survey office
44
Government Office
41
Washington US Geological Survey 1914
34
Surveyor General's
33
Berlin E.S. Mittler & Sons 1905
28
Washington US Geological Survey 1919
26
Marine Surveyor Department
22
Poona (Pune) Government Photozincographic Office 1875
21
Washington US Geological Survey 1918
20
Surveyor General's Office
19
Berlin E.S.Mittler & Sons 1905
18
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