STAFF USBM I C 8335 POTENTIAL SOURCES OF ALUMIND GEOL SURVEY C 266 COAL RESOURCES OF IND 1955PETERS FRANK A AND PAUL W JOHNSON BUMINES I C 8648 1974PETERS FRANK A ET AL BUMINES R I 6927 1967IND GEOL SURVEY REPORT OF PROGRESS NO 11 PA UNDERCLAYSUSGS B 708 HIGH GRADE CLAYS OF THE EASTERN USBUMINES TECHNICAL PAPER 417 ANALYSES OF INDIANNA COALS 1927