- Fox, J. E., 1993, Stratigraphic cross sections A-A‘ through F-F‘, showing electric logs of upper Cretaceous and older rocks, Powder River Basin, Montana and Wyoming: Oil and Gas Investigation Chart 135, 6 cross sections on 3 sheets ;54 x 76 cm. or smaller, sheets 148 x 82 cm. or smaller, folded in envelope 30 x 24 cm.,
- Fox, J. E., 1993, Stratigraphic cross sections G-G‘ through L-L‘, showing electric logs of upper Cretaceous and older rocks, Powder River Basin, Wyoming: Oil and Gas Investigation Chart 136, 6 cross sections on 3 sheets ;53 x 70 cm. or smaller, sheets 147 x 81 cm. or smaller, folded in envelope 30 x 24 cm.,
- Fox, J. E., 1993, Stratigraphic cross sections M-M‘ through R-R‘, showing electric logs of upper Cretaceous and older rocks, Powder River Basin, Wyoming: Oil and Gas Investigation Chart 137, 6 sections on 3 sheets ;sheets 148 x 79 cm., or smaller, folded in envelope 30 x 24 cm.,
- Fox, J. E., 1993, Stratigraphic cross sections S-S‘ through V-V‘, showing electric logs of upper Cretaceous and older rocks, Powder River Basin, Montana and Wyoming: Oil and Gas Investigation Chart 138, 4 cross sections on 2 sheets ;54 x 76 cm. or smaller, sheets 148 x 82 cm. or smaller, folded in envelope 30 x 24 cm.,
- Seeland, David A.; Hardie, J. K.; Gibbons, A. B.; Johnson, E. A.; Biewick, L. R.; McLellan, M. W.; Molnia, C. L.; Pierce, F. W., 1993, Geophysical log signatures of lower Tertiary and upper Cretaceous rocks in the Powder River Basin, Wyoming and Montana: Oil and Gas Investigation Chart 140, 1 diagram ;56 x 74 cm., folded in envelope 30 x 24 cm.,
