USGS C Maps:

C 20 / Coal Resources of the La Veta Area, Colorado, $ 10

C 21 / Geology of Anthracite in the Western Part of the Shanandoah Quadrangle, Pennsylvania, $ 15

C 22 / Preliminary Coal Map of the Cornettsville Quadrangle, Kentucky, $ 10

C 25 / Geology of Anthracite in the Western Part of the Delano Quadrangle, Pennsylvania, $ 10

C 26 / Geology and Coal Resources of the Gulnare, Cuchara Pass, and Stonewall Area, Colorado, $ 10

C 27 / Geology and Coal Deposits of the Seelyville Quadrangle, Indiana, $ 10

C 29 / Preliminary Geologic Map of the Ship Rock and Hogback Quadrangles, New Mexico, $ 10

C 32 / Preliminary Geologic Map of the Kirkland Quadrangle, New Mexico , $ 10

C 37 / Geologic Map of the Bar H Area, Slim Buttes, South Dakota, $ 10

C 46 / Geology of the Anthracite in the Eastern Part of the Shamokin Quadrangle, Pennsylvania, $ 10

C 47 / Geology of the Anthracite in the Western Part of the Shamokin Quadrangle, Pennsylvania, $ 10

C 48 / Geology of Anthracite in the Southern Part of the Trevorton Quadrangle, Pennsylvania, $ 10

C 49 / Geology and Fuels Resources of the Orderville - Glendale Area, Utah, $ 10

C 50 / Preliminary Lithologic and Structural Map of Sunnyside No. 1 Mine Area, Utah, $ 10

C 81 A / Structure Contour Maps of the Canyon and Associated Coal Beds, Western Half of the Recluse 1 x 2 Quadrangle, Wyoming, $ 10

C 87 / Geologic Map and Coal Resources of the Easton Gulch Quadrangle, Colorado, $ 10

C 102 / Surficial Materials Map of the Kemmerer 30 x 60 Quadrangle, Wyoming, $ 10

C 103 / Surficial Materials Map of the Evanston 30 x 60 Quadrangle, Wyoming, $ 10

C 110 / Location of Coal and Carbonaceous Shale Beds exposed in the Eastern Part of the Kemmerer 15-minute Quadrangle, Wyoming, $ 10