This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
sanitary ship canal excavation illinois chicago drainage sanitary and ship canal sanitaryandshipcanal chicago drainage canal chicagodrainagecanal blackandwhite monochrome outdoor black and white View of O.C. Farrington verify standing in the excavation site of the new Chicago Drainage Sanitary and Ship Canal. ampquotConstruction proceeds