Harmon Craig sampling the basaltic lavas on one of the La Perouse Pinnacles, after jumping off a boat onto a pinnacle. The basaltic rocks were collected to measure 3H3/4He ratios in the search for places where primordial 3He is brought up from the lower mantle of the earth. n.d.

• Harmon Craig

This digital image is a surrogate of an item from the Harmon Bushnell Craig Papers, 1923-2005

• Scripps Institution of Oceanography

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2021-05-12