Civil engineering history comes to life in this Sixth Edition of "Standard Specifications for Highway Bridges," published by The American Association of State Highway Officials (AASHO) in 1953. This technical manual, a third printing from April 1955, provides a comprehensive look at mid-century infrastructure standards, covering design specifications, material protocols, and construction methods for concrete, steel, and timber bridges. The volume features distinctive "SUPERSEDED" stamps throughout, along with a professional stamp from F. R. Martin Consulting Engineer and period-correct handwritten annotations that add unique provenance to this historical artifact. An essential reference for collectors of vintage engineering texts, historians, or academic researchers interested in the evolution of American highway design and construction protocols.