| Reference | {Deposit:: EDWARDS, JR., J., 1971, MARYLAND I.C. 11, P. 15.}{Deposit:: MESA HEALTH AND SAFETY INSPECTION REPORT FEBRUARY 14-16, 1972.}{Deposit:: SERPENTINE QUARRY IS OPERATED BY ROCKVILLE CRUSHED STONE COMPANY,}{Deposit:: INCORPORATED. OPERATION INCLUDES A PLANT.} |