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 77
PREPARATION OF ILLUSTRATIONS PLATE VXH U. a GEOLOGICAL SURVEY … 27 26 26 28 29 ^' 30 31 32 •t +^+ * + ***+* m 3:,", ■; 38 37 <^vx_\v.^v\','S'v",v>;<.x, ,x,« ■■■■ ■• ^. ■■".•■:• ■■'■■■■'■'■yAy^<^^ §C«'-'-'- ■ ■ ■■■■•■•■-vy </^>S''>^-^\\'Q^y^>C^' PATTERNS USED TO SHOW DISTINCTIONS BET^VEEN AREAS ON BLACK AND WHITE MAPS Contraata may be increased by varying the…
Topographical drawing · Map drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
