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: 15; Original Publisher: Geological and Natural History Survey of Minnesota.; Publication date: 1887; Subjects: Geology; Mines and mineral resources; Paleontology; Mineralogy; Zoology; Botany; Nature / Fossils; Science / Life Sciences / Botany; Science / Earth Sciences / General; Science / Earth Sciences / Geology; Science / Earth Sciences / Mineralogy; Science / Paleontology; Technology