The preparation of illustrations for reports of the United States Geological survey : with brief descriptions of processes of reproduction (1920)
Ridgway, John L. (John Livesy), b. 1859, United States. Dept. of the Interior, Geological Survey (U.S.) · Washington, D.C. : Government Printing Office · leaf 69
V. S. GEOLOGICAL SURVEY PREPARATION OF ILLUSTRATIONS PLATE VI 175-LINE SCREEN. 150-LINE SCREEN. 133-LINE SCREEN. 120-LINE SCREEN. 100-LINE SCREEN. 65-LINE SCREEN. HALF-TONE CUTS SHOWING EFFECT OF SEVERAL STANDARD SCREENS IN THE REPRODUCTION OF THE SAME DETAIL.
Topographical drawing · Map drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.