Proofs, Drafts, and ArtworkWillems, Mo, 1968-2003-2007chidutengfreitajpnkorperIncludes proofs, drafts, or artwork for Elephant and Piggie - I Am Invited to a Party! (2007), Leonard, the Terrible Monster (2005), Time To Pee! (2003), and Time To Say "Please"! (2005).