This project was supported by the National Science Founation, the U.S. Department of Energy, and the Kellogg Endowment Fund of the National Academy of Sciences and the Institute of Medicine
This report is available on the National Academy of Sciences’ Internet host. It may be accessed via World Wide Web at http://www.nas.edu, via Gopher at gopher.nas.edu, or via FTP at ftp.nas.edu
Includes bibliographical references (p. 203-207)
Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries