. . . "Delaware and Schuylkill navigation company" . . "canal" . . . . "Delaware and Schuylkill Navigation Company" . . . . . . . . "1791" . . . . . . "Society for Promoting the Improvement of Inland Navigation" . . . . . . . "this article" . "Pennsylvania State River Surveys of 1790" . . "Schuylkill & Susquehanna Navigation Company" . "Pennsylvania Colony River Surveys of 1769\u20131773" . "Schuylkill and Susquehanna Navigation Company" . . . . "Delaware and Schuylkill Canal" . "1811" . "Pennsylvania Colony River Surveys of 1769-1773" . . . . "Schuylkill Valley Navigation Company" . . "Schuylkill and Susquehanna Navigation Company" . . . . . "Delaware and Schuylkill Canal Company" . . .