[Tunnel construction.]

[Holland Tunnel.]

[Tunnel construction.]

Midtown Tunnel under Hudson River, April 24, 1935

[Constructing the McAdoo Tunnel.]

[Holland Tunnel.]

[McAdoo Tunnel.]

[Unloading ring from truck.]

[McAdoo Tunnel.]

Building the McAdoo Tunnel, Under the Hudson River, New York.

Southbound express tunnel.

[Holland Tunnel.]

Queensboro Tunnel.

Queensboro Tunnel.

Queensboro Tunnel.

Rondout Pressure Tunnel Showing Partial and Total Concrete Lining [Catskill System.]

Drilling and Mucking Bench [of] Lower Half of Tunnel [Catskill System.]

[Subway tunnel.]

[Holland Tunnel.]

[McAdoo Tunnel.]