- Barnum, Bruce E., 1975, Geologic map and coal resources of the Ranchester Quadrangle, Sheridan County, Wyoming, and Big Horn County, Montana: Coal Map 75, 1 map :col. ;58 x 41 cm. on sheet 82 x 105 cm. fold. in envelope 30 x 24 cm.,
- Bowers, William E., 1975, Geologic map and coal resources of the Henrieville Quadrangle, Garfield and Kane counties, Utah: Coal Map 74, 1 map :col. ;58 x 47 cm., on sheet 82 x 130 cm., folded in envelope 30 x 24 cm.,
- Sanders, Robert B., 1975, Geologic map and coal resources of the Creston Junction Quadrangle, Carbon and Sweetwater counties, Wyoming: Coal Map 73, 1 map :col. ;71 x 74 cm. fold. in envelope 30 x 24 cm.,
- Soward, Kenneth S., 1975, Geologic map and coal resources of the White Butte West Quadrangle, Hettinger County, North Dakota: Coal Map 69, 1 map :col. ;58 x 40 cm. on sheet 74 x 119 cm. fold. in envelope 30 x 24 cm.,
- Soward, Kenneth S., 1975, Geologic map and coal resources of the White Butte East Quadrangle, Hettinger County, North Dakota: Coal Map 70, 1 map :col. ;58 x 40 cm. on sheet 74 x 107 cm. fold. in envelope 30 x 24 cm.,
- Soward, Kenneth S., 1975, Geologic map and coal resources of the White Butte NW Quadrangle, Stark and Hettinger counties, North Dakota: Coal Map 71, 1 map :col. ;58 x 40 cm. on sheet 71 x 104 cm. fold. in envelope 30 x 24 cm.,
- Soward, Kenneth S., 1975, Geologic map and coal resources of the White Butte NE Quadrangle, Stark and Hettinger counties, North Dakota: Coal Map 72, 1 map :col. ;58 x 40 cm. on sheet 74 x 105 cm. fold. in envelope 30 x 24 cm.,
