. . . . "Portsmouth quadrangle, Kentucky-Ohio, quadrangle map"@en . . . . . "Wheelersburg quadrangle, Kentucky, parts of, geologic map"@en . . . . . . . "Maps"@en . "New Boston quadrangle, Kentucky, parts of, geologic map"@en . "Geology of the Portsmouth quadrangle, Kentucky-Ohio, and parts of the Wheelersburg and New Boston quadrangles, Kentucky"@en . "Geology of the Portsmouth quadrangle, Kentucky-Ohio and parts of the Wheelersburg and New Boston quadrangles, Kentucky" . . "U.S." . . . .