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~~,yl ~I. <br />' ;J. <br />s ~ ~ ~~ <br />Y. <br />~^ <br />f,,~ ;. <br />.`+ ~ <br />_'- ~ ' <br />'~ . r`... <br />j ~ ..~s <br />~r. y- <br />.~; •. <br />;0 1 <br />a. ..r. <br />~~' <br />. _ .;{' <br />`tom ,•~,: <br />~~ <br />i <br />Y <br />27 <br />REFERENCE <br />Duvall, W.I. and Fu'gelson, D.E., 1961: Review of criteria for ~- <br />estimating damage to residences from blasting vibrations, <br />U.S. Bureau of Mines Report of Investigations 5968, 16p. <br />J <br />- rte, <br />.~ <br />. ~~ '.. <br />,1 ~ ", <br />~ i.. <br />~~ ~ ~' :., <br />~, <br />•~: <br />ti. ~ I <br />L ~~ . <br />4. ~ : ~' : A..; <br />,. ...' lit <br />ry1 F~ <br />:~~ <br />~,~' ~nf <br />•~ h <br />~ . ~ . .. <br />k,~. <br />.;:;, <br /> <br />M(CROGEOPHYS(CS <br />