Originally Posted by Gerald C Koch
An older book but still a useful one as it explains some things not found in other books. J G Lootens, On Photographic Enlarging and Print Quality, Amphoto (New York: 1967). Amazon has used copies.
Older, literally... Mine's 1951 and original Copyright 1944 by THE CAMERA, INC.
It's a wonderful book, belongs in your collection.