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Geochemistry of apollo 15 basalt 15555 and soil 15531.
Schnetzler CC, Philpotts JA, Nava DF, Schuhmann S, Thomas HH. Schnetzler CC, et al. Science. 1972 Jan 28;175(4020):426-8. doi: 10.1126/science.175.4020.426. Science. 1972. PMID: 17731364