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02h0038741 20130828104918.0 s1964 iluab frb |000|||eng | CNY150.00 NGL a513.4 ; a450 Howard, Richard H. Niagaran reefs and oil accumulation in the DeWitt-McLean County area, Illinois / Richard H. Howard. Urbana : Illinois State Geological Survey, 1964. 15 p. : ill., maps ; 25 cm. Circular / Illinois States Geological Survey ; 377 Bibliography: p. 15. Geology, Stratigraphic ; Petroleum ; Petroleum ; Geology ; Geology Silurian. Illinois ; DeWitt County. ; Illinois ; McLean County. ; Illinois ; De Witt County. ; Illinois ; McLean County. Circular / Illinois States Geological Survey ; 377. aCN bNGL 010001 P 254.2 C49i v377 ; rCNY150.00 ; h1 wang011