Gorgeous large format map, colored by counties and showing remarkable detail. Inset of Boston. Fold split at centerfold extends 2 inches into image, else an excellent example.
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.