Historical Marker

What's the O-Line?

Historical marker location:
3001 Connecticut Ave NW, Smithsonian National Zoo, District of Columbia
( Marker is on Olmsted Walk, 0.2 miles west of North Road, on the left when traveling west.)

Washington, D.C. is a city that has grown politically by leaps and bounds.
Pierre Salinger in The Miami News, August 4, 1959
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