Via: ddotdc:

A picture map of the Washington Metropolitan Region, created for the official bicentennial celebration of the American Revolution (1776-1976). Dated 1975. 

Please view a full, high-resolution version of the map.

Image 2: This section of the map gives an overview of the District, as well as listing information about different Metrobus stops and the in-progress Metrorail (which opened in March 1976, just before the bicentennial). 

Image 3: The map gives an up-close look at different sections of the city and inner-ring suburbs, including: Georgetown, Dupont Circle, Southwest, Capitol Hill, and Old Town Alexandria. These special sections point out landmarks such as Howard University, the Library of Congress, the Folger Shakespeare Library, and Rock Creek Park. It also provides information on famous buildings such as the Willard Hotel, the Old Post Office, and the British Embassy. 

Image 4: The last section provides historical details about the District and the surrounding region, including facts about the National Mall, a graph that charts the city’s population growth, and the March on Washington in 1963.

Well, this is just gorgeous (and relevant, as it has a little map of the nascent Metrorail system in the second image).