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- Received June 11, 1991; Accepted July 29, 1991
Authors' Names and Addresses: ECKHARD W. HEYMANN, Deutsches Primatenzentrum (German Primate Center), Kellnerweg 4, 3400 Göttingen, Germany; GERALD HARTMANN, Institute of Geochemistry, University of Göttingen,
Goldschmidtstrasse 1, 3400 Göttingen, Germany
