Location of magnetic observatories in United States and Pacific Ocean. San Juan
, Cheltenham, Tucson, Sitka, and Honolulu were Coast and Geodetic Survey
magnetic and seismological observatories.
Image ID: cgs00092, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1935 Ca.
Category: Geophysics Magnetics/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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April 30, 2013