Construction: Civil Works

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A 50-Ton Plymouth (Joe Brockmeyer photo 16 May 1970 / R. Craig collection)

American Bridge

Guy F. Atkinson

Bechtel

Day & Zimmerman

Gifford-Hill

S. J. Groves & Sons

Morrison-Knudsen

Oro Dam Constructors

Perini Constructors

Raymond International

Sanderson & Porter

Stone & Webster