U.S. GEOLOGICAL SURVEY. / CLARK, W. B. Physical atlas of Maryland Allegany County. Map of Allegany County showing the geological formations and agricultural soils / Maryland Geological Survey… [Baltimore], Maryland Geological Survey, 1900. 600 x 500 mm. Lithographie en couleurs. Folio. Six colored lithographed maps, loose in original wrappers, detached and slightly worn. Each map : 52 x 43 cm.Large folio atlas, cover detached and damaged. Six color lithographed maps. 52 x 43 cm each. Paper slightly yellowed. Map of Allegany County showing the geological formations and agricultural soils produced by the Maryland Geological Survey, W.m Bullock Clark, State Geologist, in co-operation with the U.S. Geological Survey, Charles D. Walcott, Director and the U.S. Soil Survey, Milton Whitney, Director; geology by C.C. O'Harra and R.B. Rowe; soils by C.W. Dorsey. This 1:62,500 scale map was produced as part of an in-depth study of the geology and mineral resources of Allegany County, directed by State Geologist William Bullock Clark. It was published by the Johns Hopkins Press in 1900.