Organic geochemistry of black shales, marlstones, and oils of middle Pennsylvanian rocks from the northern Denver and outheastern Powder River Basins, Wyoming, Nebraska, and Colorado /
Organic geochemistry of black shales, marlstones, and oils of middle Pennsylvanian rocks from the northern Denver and outheastern Powder River Basins, Wyoming, Nebraska, and Colorado /
by J.L. Calyton... [et.al.]
- Washington : U.S. Government Printing Office, 1992
- 44 p. : ill. ; 28 cm.
- U.S. geological suvery bulletin ; 1917-K .