. . . "El Dado quadrangle, McKinley County, New Mexico, federal coal resource occurrence"@en . . . "Coal development potential map of the El Dado quadrangle, McKinley County, New Mexico"@en . . "Federal coal resource occurrence and coal development potential maps of the El Dado 7 1/2 minute quadrangle, McKinley County, New Mexico"@en . . . . "Maps"@en . . . . "Coal resource occurrence map of the El Dado quadrangle, McKinley County, New Mexico, 1979"@en .