​RARE:  Black & White Photographic Pictorial of the Bay Bridge Construction (taken daily by I. O. "Jolly" Jahlstrom who was the Head Engineer)

I. O. "Jolly" Jahlstrom spent 37 years of his career, from 1927-1965, as a bridge engineer for the Division of Highways. He retired as Principal Bridge Engineer–Operations in 1965. He was resident engineer on several major bridge construction projects including the Bixby Creek Arch and the San Francisco-Oakland Bay Bridge substructure and superstructure contracts for the twin suspension spans of the West Bay Crossing.