TY - BOOK ID - 137858301 TI - Bibliography and index of U.S. Geological Survey publications relating to coal, January 1971-June 1974 AU - Walker, Flora K. AU - Averitt, Paul AU - Geological Survey (U.S.) PY - 1975 PB - [Reston, Virginia] : United States Department of the Interior, Geological Survey, DB - UniCat KW - Coal KW - Coal mines and mining KW - Geological Survey (U.S.) KW - United States. UR - https://www.unicat.be/uniCat?func=search&query=sysid:137858301 AB - ER -