Great trio for photographers of any type. These are bound books, not the inserts booklets in a related series. Pictures of the indexes of each of these tell the story; #9 (1974)includes pet, travel, people, minerals and other techniques; #10 re wild birds, buiding a home studies, wildflower, sports, and polarzied ligth, (1977) and #11(1979) has longer articles on 'Imagineering.." Slide copying techniques and photographing the Sky. All useful and t...hought-provoking resources for any photographers.