"The Pennsylvania Business State Directory, for 1850-51: containing the names of professional men, mercantile firms, and manufacturing establishments, together with all the courts, post offices, public institutions, banks, corporations, companies, hotels, associations, &c, &c, throughout the state, also the principal firms fo the city of Cincinnatti, Ohio, and Baltimore, Maryland: together with a great variety of other useful matter, which has been collected expressly for this work by agenst who have canvassed every county in the state." Originally published by Giles & Brothers in 1850. 247 pages, includes state map.