Technically Recoverable Resources in Continuous-Type Deposits
http://pubs.usgs.gov/circ/1995/circ1118/resass/cont_dep_coalgas.html

USGS


This USGS site provides links to a map and tables of recoverable methane in the lower 48 States. Included are areas where methane is already being extracted, and potential additions to reserves of coal-bed gas.

This resource is referenced here:
Subject: Environmental Science:Ecosystems:Biogeochemical cycling
Resource Type: Audio/Visual:Maps
Focus on the Cretaceous: Human Impacts, Economic Resources
Theme: Teach the Earth:Course Topics:Biogeoscience, Environmental Science