Detailed plan of Baltimore, colored by wards. Shows streets, rail lines, Fort McHenry, Parade Grounds, Hospitals, Churches, Wharfs, Public Squares, Mt. Clare and Mt. Clare Station, Colleges, Cemetaries, the City Docks, Chemical Works, City Jail and a host of other details.
O. W. Gray was a publishing firm based in Philadelphia. Later, they published as O. W. Gray & Son. They published atlases in the late nineteenth century. Gray's National Atlas was one of the most successful commercial ventures of the 1870s and one of the last to employ hand coloring on maps.