The Load of Unicorn By Books / Paperback Special Collections / Author Archives › Barbara Mertz Collection Publisher: Puffin Books, January 1966 Price $37.58 Free Shipping Send to a friend Collectible - Good Collectible - Good. Mertz's signature on front endpage. Barbara G. Mertz Rev Trust custom bookplate on front inside cover. This book formed part of Barbara G. Mertz's personal library at her home in Frederick, Maryland. (childrens, medieval, historical fiction) $37.58 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.