Oil and gas fields of Colorado: Statistical data through 1981. 72 pages. 3 figures. See also IS-50. Digital PDF download. IS-18D
Information Series 18 is presented as an update and revision of a previous Colorado Geological Survey publication, IS-3. Accompanying IS-18, the Colorado Geological Survey also published Map Series 22, Colorado Oil and Gas Fields. This publication was updated by IS-50 Oil and Gas Fields of Colorado Statistical Summary through 1996.