- Brownfield, M. E.; Anderson, Kevin, 1988, Geologic map and coal sections of the Lay Se Quadrangle, Moffat County, Colorado: Coal Map 117, 1 map and 1 data sheet :col. ;58 x 44 cm., on sheet 87 x 74 cm. and sheet 59 x 109 cm., folded in envelope 30 x 24 cm.,
- Conner, Carol Waite, 1988, Maps showing outcrop, structure contours, cross sections, and isopachs of partings; Mammoth coal bed, Paleocene Tongue River Member of the Fort Union Formation, Bull Mountain coal field, south-central Montana: Coal Map 126-A, 4 maps on 2 sheets :col. ;46 x 64 cm., sheets 98 x 147 cm. and 106 x 142 cm., folded in envelope 30 x 24 cm.,
- Ellis, Margaret S.; Freeman, Val L.; Donnell, John R., 1988, Cross sections showing correlation of coal beds and coal zones in the Mesaverde Formation in the Carbondale 30‘ x 60‘ Quadrangle, west-central Colorado: Coal Map 97-B, 1 map and 1 data sheet :col. ;56 x 87 cm., on sheet 100 x 147 cm. and sheet 101 x 143 cm., folded in envelope 30 x 24 cm.,
- Hardie, John K.; Arndt, Harold H., 1988, Geology, structure, and coal beds of the Fort Union Formation in the eastern part of the Fort Peck Indian Reservation, Daniels, Roosevelt, and Sheridan counties, Montana: Coal Map 122-A, 1 map :col. ;sheet 80 x 127 cm., folded in envelope 30 x 24 cm.,
- Johnson, Edward A.; Brownfield, M. E., 1988, Regional correlation of the middle coal group of the Upper Cretaceous Mesaverde Group, Yampa coal field, Moffat and Routt counties, Colorado: Coal Map 123, 1 section ;sheet 65 x 76 cm.,
- McLellan, Marguerite W.; Biewick, Laura R. H., 1988, Stratigraphic framework of the Paleocene coal beds in the Broadus 30‘ x 60‘ Quadrangle, Powder River basin, Montana-Wyoming: Coal Map 119-A, 1 map and 1 data sheet :col. ;55 x 61 cm., on sheet 101 x 142 cm. and sheet 81 x 112 cm., folded in envelope 30 x 24 cm.,
- Molnia, Carol L.; Orrell, S. A., 1988, Map showing principal coal beds and bedrock geology of the Buffalo Creek-Clear Creek area, central Powder River basin, Wyoming and Montana: Coal Map 114, 1 map :col. ;55 x 79 cm., on sheet 71 x 112 cm., folded in envelope 30 x 24 cm.,
