Vintage color history

I inherited a vintage book “Achievement in Photo-Engraving and Letterpress Printing” 1927, it’s ONLY 488 pages with over 600 illustrations. Published by the American Photo-Engravers Association (Chicago, IL). “Definition: Photo-Engraving is an interpretive art founded upon photo-mechanical processes enhanced by skill and artistry, which translate and convert tone values into relief printing surfaces, from which…