'Compiled, drawn, and engraved under the supervision of J.H. Colton and A.J. Johnson.' Relief shown by hachures and spot heights. Scale [ca. 1:3,041,280]. 1 in. to approx. 48 miles (W 124°--W 103°/N 42°--N 31°). Hand colored Prime meridians: Greenwich and Washington Plates 54 & 55 removed from Johnson's New illustrated family atlas of the world, with descriptions geographical, statistical and historical ... New York, 1862 Title page of atlas.
From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The slide reads: "Comparison of the cumulative estimated dose with diagnostic x-rays 1951 to 1958.