This is a HUGE transportation/street map of Washington DC and Metropolitan Area issued in 1977 by the District of Columbia Department of Transportation.  Fully folded it is approximately 9x5".  The big, full page map on one side is approximately 37x40 inches, and the smaller map on the flip side is approximately 31x25.  Map is in great condition, with a little dirt/smudging on the part that's exposed when fully folded.

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