Dredge and steamboat.

Title: Dredge and steamboat.
Description: A mechanical dredge out on the water billowing steam. There is a sign that says "Dredge No. 7 Great Lakes Dredge & Dock Co" and several workers standing on the deck. In the distance is a steamboat looking low in the water with several figures standing on the deck.
Publisher: unknown
Subject: Dredging.
Dredging machinery
Great Lakes Dredge & Dock Company
Great Lakes (Ill.)