RADIOGENIC ORIGIN OF THE HELIUM ISOTOPES IN ROCK
We are very grateful for the loan of their efficient neutron counters and for much help to Professor G. Cocconi and to Doctor V. T. Cocconi. The management of the Cayuga Rock Salt Company, Ithaca, N.Y., generously provided opportunity to carry out the work underground. Professor P. Hurley, of the Massachusetts Institute of Technology, Cambridge, Mass., and Professor H. Brown of the California Institute of Technology, Pasadena, Cal., have contributed a great deal by their comments both in writing and in person. Professor David B. Beard, now of the University of California at Davis, Cal., first carried out many of these calculations when he was working at Cornell University at Ithaca, N.Y.

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