Underground in the Virginia-Pocahontas Coal Company Mine #3, near Richlands, Virginia, in April 1974. The tunnel is 1,250 feet below the surface and one-and-a-half miles from the elevator shaft that brings the miners to and from work. (Jack Corn/NARA)

Signs crowd the roadway in this Las Vegas street scene, shot in May of 1972. (Charles O’Rear/NARA)

Day becomes night when industrial smog is heavy in North Birmingham, Alabama, as on this day in July of 1972. Sitting adjacent to the U.S. Pipe plant, this is the most heavily polluted area of the city. (LeRoy Woodson/NARA)

Smoke and gas from the burning of discarded automobile batteries pours into the sky near Houston, Texas, in July of 1972. (Marc St. Gil/NARA)

Looking east along Alaska’s Glen Highway, toward Mount Drum (Elevation 12,002 Feet) at the intersection of the highway and the under-construction Trans-Alaska Pipeline in August 1974. The 48-inch diameter pipeline will cross the roadway between the two vehicles. The exact point is marked by a pair of wooden stakes along the right shoulder at Mile 673. (Dennis Cowals/NARA)

A man rides in a graffiti-covered subway car in New York City in May of 1973. (Erik Calonius/NARA)

A mountain of damaged oil drums lies in a heap in an Exxon refinery near Baton Rouge, Louisiana, in December of 1972. (John Messina/NARA)

Clark Avenue and Clark Avenue bridge, looking east from West 13th Street, obscured by industrial smoke, in Cleveland, Ohio, in July of 1973. (Frank J. Aleksandrowicz/NARA)

Water cooling towers of the John Amos Power Plant loom over a home located across the Kanawha River, near Poca, West Virginia, in August of 1973. (Harry Schaefer/NARA

Near Boston’s Logan Airport, an airplane comes in for a landing over homes on Neptune Road in May of 1973. (Michael Philip Manheim/NARA)

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