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The horizontal intensity of the earth's magnetic force, expressed in centimeter, gram, second units, epoch 1965.0.

Bibliographic Details
Corporate Author: U.S. Coast and Geodetic Survey
Format: Map
Language:English
Published: Washington : U.S. Naval Oceanographic Office, 1965-66.
Subjects:
Geomagnetism > Maps.
Description
Item Description:"H.O. 1701."
Different eds.
"Mercator projection."
"Compiled by the U.S. Coast and Geodetic Survey in consultation with the Royal Greenwich Observatory and in collaboration with the U.S. Naval Oceanographic Office."
Cartographic material.
Physical Description:color maps ; 79 x 117 cm.