OCR Text |
Show basin, and to Dr. Emil W. Haury, Dr. Gordon C. Baldwin, and Dr. Jesse L. Nusbaum for their collaboration in the preparation of the chapter, Prehistory of Man. Appreciation is also expressed to the many individuals listed on page 223, who generously contributed their time and special knowledge in checking various portions of the life zone map and the biological information presented in the text. Although the report is dated June 1946, a few minor revisions in the original draft have been made subsequently in order to include later information, such as revised height of proposed dams and the redesignation of Boulder Dam as Hoover Dam and Boulder Dam Recreational Area as Lake Mead Recreational Area. NEWTON B. DRURY, Director, National Park Service. xviii |