National Geographic : 1931 Nov
ON (A From an altitude of 20,000 feet Photograph by Capt. Albert W. Stevens THE DISTRICT OF COLUMBIA SPREAD BEFORE THE EYE An inch and a quarter from the top of the picture are the rapids below the Great Falls of the Potomac. The falls arehidden bythe gorge and bywoods. The dark area in the middle ground on the right is Rock Creek Park.