A beautiful 1848 map of Pennsylvania, New Jersey, Maryland, Delaware and Virginia issued by the S.D.U.K. The map covers the states of Pennsylvania, New Jersey, Maryland and Delaware in full with parts of modern day Virginia and West Virginia. Color coded according to state, the map also includes the District of Columbia. Counties are noted with outline color. Several important topographical features including rivers, mountains, lakes, etc. are noted throughout. Published in 1848 by Charles Knight of 22 Ludgate Street for the Society for the Diffusion of Useful Knowledge, or S.D.U.K. This was most likely the last edition of the S.D.U.K. atlas to be published before the society formally closed its doors. However, it is known that subsequent reissues of the S.D.U.K. atlas were printed well into the 1870s by Chapman and Hall, who acquired the original plates.