Library's c.2 mounted on cloth backing. "Prepared in cooperation with Division of Labor Statistics, Department of Industrial Relations, Divisions of Mine, Department of Industrial Relations, Engineering Experiment State, The Ohio State University and State Highway Testing and Research Laboratory." by G.W. White and G.C. Gambs (with the assistance of G.R. Washburn) Scale 1:500,000 ; Lambert conformal conic projection. "Base map from U.S. Geological Survey."
This item, made available for research and educational purposes, may be protected by copyright; the user is responsible for making a final determination of copyright status.