James M. Robertson and Ronald F. Broadhead, project directors ; Anthony W. Gorody, contract manager, Gas Research Institute ; Carol A. Hjellming, project editor
by Belinda F. Arbogast ... [and others] ; prepared in cooperation with the Colorado Geological Survey for the United States Department of Agriculture Forest Service
report prepared jointly by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, cooperating organization, Colorado Geological Survey