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Cruise Co-Chief Scientists James Heirtzler (left) of Woods Hole Oceanographic Institution, Massachusetts, and Leonid Dmitriev (right) from the Institute of Geochemistry, Academy of Sciences of the USSR, Moscow, on Leg 46 of the Deep Sea Drilling Project. They are examining a seismic profile record for a seismic reflection check as the research vessel D/V Glomar Challenger (ship) near a proposed drilling site. 1976.