Manhattan Bridge with Twin Towers behind Zoo It is unusual in that

It is unusual in that it was designed as a dual-level bridge

857 images on black & white film and 550 on color film

Emswyler and Dupont Bill

and bird's-eye view map of northeastern United States

1939 as a color silkscreen

Manhattan Bridge with Twin Towers behind Zoo It is unusual in thatManhattan Bridge, Spanning East River at Flatbush Avenue, between New York City & Brooklyn, New York, New York, NY. Photograph by Jack Boucher in 4x5 inch negative. Building structure dates: 1909 initial constructionSignificance: This single span suspension bridge contains one of the longest suspension spans in the U. S., and had the largest carrying capacity in the country when it was built. It is unusual in that it was designed as a dual level