Post route map of Maryland and Delaware and of District of Columbia, showing post offices with intermediate distances on mail routes in operation on June 1, 1910, scale 5 m.=1 in.; with insets, District of Columbia and vicinity, scale 2 m.=1.2 in.; Baltimore [Md.] and vicinity, scale 2 m.=1.3 in.
Publication Title:
Post route map of Maryland and Delaware and of District of Columbia, showing post offices with intermediate distances on mail routes in operation on June 1, 1910, scale 5 m.=1 in.; with insets, District of Columbia and vicinity, scale 2 m.=1.2 in.; Baltimore [Md.] and vicinity, scale 2 m.=1.3 in.
Display Title:
Post route map of Maryland and Delaware and of District of Columbia, showing post offices with intermediate distances on mail routes in operation on June 1, 1910, scale 5 m.=1 in.; with insets, District of Columbia and vicinity, scale 2 m.=1.2 in.; Baltimore [Md.] and vicinity, scale 2 m.=1.3 in.