GRAAF, Regnier de. Tractatus anatomico-medicus de succi pancreati natura & usu. Leiden: Hack, 1671. 8o. Engraved title and 3 folding plates (lacks portrait). Contemporary vellum. FIRST EDITION. NLM/Krivatsky 4913. -- Partium genitalium defensio. Leiden: Hack, 1673. 12o. Modern calf. FIRST EDITION. NLM/Krivatsky 4911. -- Opera omnia. Leiden: Hack, 1677. 8o. Engraved title, 23 plates and numerous full-page engravings in text. Contemporary vellum. FIRST COLLECTED EDITION. NLM/Krivatsky 4905. -- Another edition. Leiden: Io. Ant. Hugvetan, 1678. 8o. Engraved title and 23 engraved plates, most folding. Contemporary calf. Second collected edition. NLM/Krivatsky 4906. -- Histoire anatomique des parties genitales, de l'homme et de la femme. Basel: Emanuel Jean George König, "MDCLXCIC" (i.e. 1699?). 8o. 41 engraved folding plates. Modern calf antique. Provenance: Alfred M. Hellman (bookplate). FIRST EDITION IN FRENCH of de Graaf's works. NLM/Krivatsky 4910. (5)