A collection of ephemera of a Lehigh alumnus, Rollin Reuben Keim, concerning his personal interests, his career as a City of Bethlehem businessman and contributions to his Lehigh Class as Class correspondent for Lehigh Alumni Bulletin. Major portion of the collection is data and visual material related to the Hill-to-Hill Bridge, Bethlehem, Pennsylvania.

The collection shows a series of construction photos of a Pennsylvania Department of Highways Parker Through Truss Bridge built by the McClintic-Marshall Company. The bridge is known as the Market Street Bridge or the Kittanning Bridge and carries Business US 422 over the Allegheny River from Kittanning, PA to Applewold on the opposite bank. Also very cursorily are a few photos and brief description of the Brewery Bridge in Latrobe, PA.