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Magnetic surveys:
purposes, methods, and instruments.

APA Citation

U.S. Coast and Geodetic Survey. (1930). Magnetic surveys: purposes, methods, and instruments. Rev. ed. 1930. Washington: U.S. Govt. print, off..

U.S. Coast and Geodetic Survey. Magnetic Surveys: Purposes, Methods, And Instruments. Rev. ed. 1930. Washington: U.S. Govt. print, off., 1930.

Warning: These citations may not always be complete (especially for serials).