An instant classic with our customers! Skoob, the Shelf Elf, just completed his work with the shoemaker and is ready to embark on a new career in the library. Using the Shelf Elf Guide to Library Etiquette, Skoob discovers the age-old practices of proper library behavior and book care. Grades PK–2. By Jackie Mims Hopkins. 32 pp. Hardcover. ISBN 978-1-932146-27-1 2004.