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 Identifier: NAP:13901; Subjects: Medical genetics; Human chromosome abnormalities; Medical policy; Medical / Diseases; Medical / Health Care Delivery; Medical / Health Policy; Medical / Public Health; Medical / Genetics; Science / Life Sciences / Genetics