lot of vintage Kodak photography & darkroom photo developing books

Lot of four 1940s and 1950s vintage Kodak photography and dark room booklets. These are all out of one estate and are illustrated with many photos, graphs, tables, charts etc.. There are: "Flash Technique" - copyright 1956, 64 pages; "Processing Chemicals and Formulas for Black and White Photography" - copyright 1954, 68 pages; "Kodak Data Book on Formulas and Processing" - 1943, 45 pages; "Developing, Printing, Enlarging with Kodak Materials" - 1953, 24 pages.

These are in nice vintage condition with some wear.