- ISBN: 9781154464153 | 1154464156
- Cover: Paperback
- Copyright: 5/5/2010
This is an OCR edition without illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from the publisher's website (GeneralBooksClub.com). You can also preview excerpts of the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Original Published by: National Academy of Sciences in 1968 in 68 pages; Original Identifier: NAP:11029; Subjects: Blind, Apparatus for the; Health