[The working chamber of the New York River Shaft Caisson.]

[Shaft of Ashokan Water Tunnel.]

Shaft No. 4, Steinway Tunnel.

Typical Pressure Tunnel Construction Shaft [Catskill System.]

[Towing New York River Shaft Ciasson from Staten Island Shipbuilding Company's yard.]

Subways, Fourteenth Street Cut for Subway, Rock Cut Looking West, Shaft 1.

[City Tunnel No. 2.]

Midtown Tunnel under Hudson River, April 24, 1935

Untitled [Tenement shaft.]

[Launching New York River Shaft Caisson.]

Gun Hill Road. Base Hospital #1. Interior of ward showing construction, view #9A. Taken for Captain Noble.

[Queens Midtown Tunnel.]

[Digging Shaft, Summit, Pa.]

[Digging subway tube under East River for Queensboro Subway.]

Construction Plant for City Tunnel at Shaft 9, 150th Street and St. Nicholas Avenue [Catskill System.]

The Queens Midtown Tunnel Opening Ceremonies

For a Further Unification of the People

Man inside the southern end of a river tunnel.

For a Further Unification of the People

Triborough Bridge and Tunnel Authority