E. D. Preston
Geodesy: Determinations of Gravity and of the Magnetic Elements in Connection with The U.S. Expedition to The West Coast of Africa, 1889-1890. Appendix No. 12-Report for 1890 - USA Government Printing Office 1891 - 684 30 cm
1891
English
General
Geodesy: Determinations of Gravity and of the Magnetic Elements in Connection with The U.S. Expedition to The West Coast of Africa, 1889-1890. Appendix No. 12-Report for 1890 - USA Government Printing Office 1891 - 684 30 cm
1891
English
General