A median section through the earth showing composition of the interior and
transmission of earthquake waves. In: Earthquakes and Astronomy" by N. H.
Heck. Published in: The Sky, March 1937. P. 14.
Image ID: cgs02177, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1937
Credit: Collected Papers of Captain Nicholas Heck, NOAA Central Library
Category: Coast and Geodetic Survey/Geophysics Seismology/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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November 10, 2017