Dubiel R.F. Depositional environments of the upper triassic chinle formation in the eastern San Juan basin and vicinity, New Mexico. Trace fossils and mollusks from the upper member of the Wanakah formation, Chama basin, New Mexico: envidence for a lacustrine origin ; J. L. Ridgley, 1989. - Pag.var.
Dubiel R.F. Depositional environments of the upper triassic chinle formation in the eastern San Juan basin and vicinity, New Mexico. Trace fossils and mollusks from the upper member of the Wanakah formation, Chama basin, New Mexico: envidence for a lacustrine origin ; J. L. Ridgley, 1989. - Pag.var. - Текст : непосредственный.
Ridgley J.L. Source rock potential of the lower part of the Mississippian St.Louis Limestone in south-central Indiana / J.L.Ridgley,V.F.Nuccio, 1995. - 12 p. - Текст : непосредственный.