[World Trade Center construction site.]

[World Trade Center construction site.]

[World Trade Center construction site.]

[World Trade Center site under construction.]

[Workers at the World Trade Center under construction.]

[Aerial view of the World Trade Center construction site.]

[Aerial view of the World Trade Center site.]

[World Trade Center under construction.]

[Installation of the steel grillages at the World Trade Center.]

[Construction site on West Side.]

[Aerial view of World Trade Center construction site with numbers.]

[World Trade Center under construction.]

[World Trade Center under construction.]

[World Trade Center under construction.]

[World Trade Center under construction.]

[World Trade Center under construction.]

[World Trade Center under construction.]

[Aerial view of the World Trade Center construction site.]

[Aerial view of the World Trade Center construction site.]

[Aerial view of the World Trade Center construction site.]