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REFERENCES <br /> 1 . Robertson , D. A . , Gould , J . A . , Straw, J . A. , and Dayton ,M. A . , <br /> "Survey of Blasting Effects on Ground Water Supplies in Appalachia , " <br /> U . S . Bureau of Mines contract report J-0285029 , printed Nov . 1980 . <br /> 2 . Siskind , D . E . and Fumanti , R . P . , "Blast Produced Fractures in <br /> Lithonia Granite , " U . S . Bureau of Mines Report of Investigations 7901 , <br /> 1974 . <br /> 3 . Dowding , C . H. "Blast Vibration Monitoring and Control , " <br /> Prentice Hall Inc . , Englewood Cliffs New Jersey , 1985 . <br />