



ISBN-13: 9780064430173
50th Anniversary editionTrade paperback

ISBN-13: 9780808593867
Bound for Schools & Libraries editionHardcover

ISBN-13: 9780061142703
AbridgedUnknown binding

ISBN-13: 9780060775865
Revised editionHardcover

ISBN-13: 9780606011495
Turtleback School & Library editionHardcover