Reference to “White Horse Inn”.
https://lccn.loc.gov/2012592159 Map of Chester County, Pennsylvania : from original surveys / by S.M. Painter & J.S. Bowen ; projection & drawing by J.S. Bowen ; engraved by Edw'd Yeager, Philad'a. [Philadelphia? : s.n.], 1847. Scale [ca. 1:63,360. 1 in. = 1 mile]. 1 map : hand col., cloth backing ; 95 x 112 cm., folded to 54 x 62 cm. G3823.C5 1847 .P3