B&W Photo: men working on the roof of a building under construction - scafolding on the right side

B&W photo of men working on the roof of a building under construction. There is scafolding on the right side. On bottom: "Alterations-Additions, Janesville Plant, Wis. General Motors Corp., Chevrolet Motor Division, ( Subjects: Construction progress Factory buildings. Catalog reference: LD70.1994.34. Category: Industry & General Motors. Tags: Buildings & Landmarks, General Motors, Factories, Businesses & Storefronts, Automobiles, Janesville, Construction, 1950s, Mid-Century, General Motors Era, Construction progress Factory buildings, T.S. Willis General Contractor Chevrolet Motor Company, location, business, industry.