Keep Up Good Work Charlie Brown By Schulz, Charles M. Books / Paperback Fiction › Comics ISBN: 0449237486 / Publisher: Ballantine Books, May 1981 Price $13.12 Free Shipping Send to a friend Used - Very Good Very Good condition. (comic strips) A copy that may have a few cosmetic defects. May also contain a few markings such as an owner’s name, short gifter’s inscription or light stamp. $13.12 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.