Recently, I came upon an old, forgotten volume (my favorite kind) that described the wood cut printing process as it was in the 1930s. It mainly showcased examples that were used as library stamps. Back then, books were more highly prized and rare. Those with bunches of books had 'libraries.' Those with the money sometimes had beautiful woodcut stamps made to forever imprint their ownership upon their volumes. I love'em. -Note the Robert Frost stamp!