50°S 40°S 30°S 20°S 10°S EQ 1CfN 20°N 30°N 40°N SrfN 60°N 70°N 



LATITUDE 



Figure 1. — Tritium in the Western Atlantic, 1972-73 (in tritium units, T atoms per total H). 



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Krishnaswami, S., D. Lai, B. L. K. Somayajulu, R. F. Weiss, 

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