Abstract This collection is composed of the papers of Willis A. Slater, a Lehigh University civil engineering professor, chair of the department and director of Fritz Engineering Laboratory. The papers give insight into Slater's professional career as a civil engineer, particularly his work with reinforced concrete. The items contained in this collection range from 1910 to 1937 and include reports, blueprints, diaries, correspondence, photographs, and notebooks. Of particular interest are Slater's...