SEUSS, Dr. The 500 Hats of Bartholomew Cubbins. New York: The Vanguard Press, 1938. 4o. Colored illustrations by the author. Original cloth backed pictorial boards (corners and edges worn). Provenance: Ralph D. Hartman (bookplate). FIRST EDITION, PRESENTATION COPY inscribed and signed by Seuss on verso front free endpaper: ''To Ralph D. Hartman with very best wishes - - Dr. Seuss.''