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:
panama canal panamacanal seth meek sethmeek samuel hildebrand samuelhildebrand fish zoology expedition zoologyexpedition central america centralamerica panama canal construction blackandwhite monochrome outdoor black and white Construction of the lower end of the Gatun lock. Concrete or cement walls. . Name of Expedition Panama