(Publication 4155.) [Reprinted by permission from Scientists look at our world, Benjamin Franklin lectures at University of Pennsylvania, 4th ser., University of Pennsylvania Press, 1952. From Report, 1953.]
Notes:
(Publication 4155.) [Reprinted by permission from Scientists look at our world, Benjamin Franklin lectures at University of Pennsylvania, 4th ser., University of Pennsylvania Press, 1952. From Report, 1953.] † Distribution Made by Issuing Office. (Limited distribution).
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† Distribution Made by Issuing Office. (Limited distribution).