Derrick boat Merganser

Cyanotype photograph showing the steel derrick boat "Merganser" being swung with a test load of 10 tons on the St. Mary's River.
Abstract/Description: Cyanotype photograph showing the steel derrick boat "Merganser" being swung with a test load of 10 tons on the St. Mary's River.
Subject(s): Boats and boating
Soo Locks (Mich.)
Date Created: 1924-09-24