The book has no 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. Volume: 52; Original Publisher: Plymouth, Mass., Published for the National Shellfisheries Association by MPG Communications; Publication date: 1961; Subjects: Shellfish fisheries; Nature / Seashells; Science / Life Sciences / Zoology / General;