Atheneum, 1972. Condition: Like New. From The Mixed Up Files Of Mrs. Basil E. Frankweiler .By E.L. Konigsburg "Signed" 1972. Condition is "Like New". This is a Rare find ! I'm very excited to offer this book. It appears to have never been read. See all the pictures for more details. Published by Atheneum . Shipped with USPS First Class. [Attributes: First Edition; Signed Copy; Hard Cover; In Dust Jacket]