Detailed map of New Hampshire, published by OW Gray.
The map is colored by townships and showing towns, counties, rivers, railroads, and substantial additional 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.