Public domain
Sinking last tubular section, Detroit River tunnel, W.S. Kinnear, chief engineer, Butler Bros. Construction Co., contractors
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineSinking last tubular section, Detroit River tunnel, W.S. Kinnear, chief engineer, Butler Bros. Construction Co., contractors. 1910-01-01. Detroit Publishing Co.. Detroit Publishing Company Collection, Library of Congress. Public domain.