[MAP] 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. Color lithograph. Large folio atlas, cover detached and damaged. Six color lithographed maps. 52 x 43 cm each. Paper a little yellowed. [Map of Allegany County showing geological formations and agricultural soils drawn by the Maryland Geological Survey, W.M Bullock Clark, State Geologist, in cooperation 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 map was produced as part of a comprehensive study of the geology and mineral resources of Allegany County, directed by William Bullock Clark, State Geologist. It was published by Johns Hopkins Press in 1900. Provenance: Société Géologique de France.