’ . . ” + . . . , ’ woe r v wm al aetna astateet whe we+ kd eea me a A RO ate eet ACKNOWLEDGEMENTS The authors wish to thank Mr. A. Lazanoff for his participation in the 1965 field investigations. We also wish to express our appreciation to J. A. S. Adams of Rice University, A. Smith and H. Wollenberg of Lawrence Radiation Laboratory and A. Liboff and T. Gunzelman of New York University for their cooperation in the intercalibration experiment To eee pemeeee hee pew arr moet

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