TY - RPRT TI - Estimates of technically recoverable natural gas resources for continuous-type (unconventional) plays in coal beds on Federal lands of the conterminous United States AU - R. A. Crovelli AU - V. F. Nuccio PY - 1997 DO - 10.3133/ofr97491 UR - https://pubs.usgs.gov/publication/ofr97491 ID - ofr97491 ER -