The author wishes to express his appreciation to Mr. ?aul Hadala for his invaluable contributions toward the successful completion of the wave propagation test conducted on an undisturbed sample of soil from the Suffield Experimental Station in the Waterwks Experiment Station 3mall Blast Load Gun rator. The author is also indebted to Mr. D. W. Murrell and Mr. J. K. Ingram for their cooperation in making a, ilable groundmotion measurements without which this paper could not have been writtan.
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