For the help given in the preparation of this book, the editors are indebted to Elaine Anderson, Assistant Curator of Paleontology, Idaho State University Museum, Pocatello; J. Lawrence Angel, Curator, Physical Anthropology, Smithsonian Institution, Washington, D. C.; Jeffrey L. Bada, Assistant Professor of Oceanography, Scripps Institution of Oceanography, University of California, La Jolla; Michael L. Bender, Professor of Oceanography, Graduate School of Oceanography, University of Rhode Island, Kingston; Francois Bordes, Professor of Geology, University of Bordeaux, France; C. Loring Brace, Curator of Physical Anthropology, Museum of Anthropology, University of Michigan, Ann Arbor; Ernest S. Burch Jr., Associate Professor of Anthropology, and Dr. William D. Pruitt Jr., Professor of Zoology, University of Manitoba, Winnipeg; Bernard Campbell, Professor of Anthropology, University of California, Los Angeles; J. Desmond Clark, Professor of Anthropology, University of California, Berkeley; Patricia Daly, Research Assistant, and Dexter Perkins Jr., Research Associate, Faunal Research Group, Department of Anthropology, Columbia University; Isabella M. Drew, Research Associate, Department of Anthropology, Columbia University; Rhodes W. Fairbridge, Professor of Geology, Columbia University; William R. Farrand. Associate Professor of Geology and Mineralogy, University of Michigan, Ann Arbor; J. H. Fremlin, Professor of Applied Radioactivity, Department of Physics, University of Birmingham, England; Paul Goldberg, Brooklyn, New York; Ralph L. Holloway, Associate Professor of Anthropology, Columbia University; Sidney S. Horenstein, Scientific Assistant, American Museum of Natural History, New York City; F. Clark Howell, Professor of Anthropology, University of California, Berkeley; William Howells, Professor of Anthropology, Harvard University; Arthur J. Jelinek, Professor of Anthropology, University of Arizona, Tucson; Clifford H. Jolly, Associate Professor of Anthropology, New York University; J. S. Kopper, Assistant Professor of Anthropology, Long Island University, New York; Alan Mann, Assistant Professor of Anthropology, University of Pennsylvania, Philadelphia; Professor J. R. Napier, Birbeck College, London; David R. Pilbeam, Associate Professor of Anthropology, Yale University; Keith Stammers, Department of Physics, University of Birmingham, England; T. Dale Stewart, Anthropologist Emeritus, National Museum of Natural History, Smithsonian Institution, Washington, D. C.; Richard H. Tedford, Curator of Vertebrate Paleontology, American Museum of Natural History, New York City.