[Subway construction.]

[Subway construction.]

[Subway construction.]

[Subway construction at Broadway, north from 100th Street.]

[Construction of the 14th Street subway.]

[Subway construction.]

[Subway construction on Broadway near 135th Street.]

Sixth Avenue subway construction.

[Constructing the subway, Queens.]

[Subway from library.]

[Constructing the subway in Queens.]

[Subway from library.]

Subway Construction.

[Subway construction.]

Subway Construction.

Subway Construction.

6th Avenue Subway Construction, 17th Street.

[Construction of the Houston Street subway.]

Subway Construction.

6th Avenue Subway Construction, 14th Street.