Washington Metropolitan Exchange Area, Chesapeake and Potomac Telephone Companies1961-01-01unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_038_14_0000_4_157The map depicts the Washington Metropolitan Exchange Area, highlighting the regions serviced by the Chesapeake and Potomac Telephone Companies. It includes a small section of Dulles Airport, marked in red. Originally, this map was part of Item 158. It is a diffusion transfer print, measuring 8 1/2 by 10 15/16 inches, and features inscriptions and shaded areas.