TY - RPRT TI - Federal coal resource occurrence and coal development potential maps of the Seven Lakes 7 1/2-minute quadrangle, McKinley County, New Mexico AU - Berge Exploration Inc. PY - 1979 DO - 10.3133/ofr791042 UR - https://pubs.usgs.gov/publication/ofr791042 ID - ofr791042 ER -