Previous ed. (B62-3442) 1962.
Visual aids: films, filmstrips and transparencies. Revised ed : [in 8 vols]. Part 6, Science 2: Nature study, botany, zoology, hygiene and health by Educational Foundation for Visual Aids. ISBN 0902115081. Published by Educational Foundation for Visual Aids in 1970. Publication and catalogue information, links to buy online and reader comments.