Hamburg, 1939. Single printed leaf (29.7 x 21.0 cm). Typed, with hand-written signature.

Typed letter (dated 14 January 1939) by the German malacologist and marine parasitologist Hubert Otto Wilhelm Caspers (1913-1998), to the French marine biologist, ichthyologist, parasitologist, and director of the Service des Pêches Coloniales, Robert Philippe F. Dollfus (1887-1976). Dollfus was a son of the malacologist Gustave Frédérique Dollfus (co-author of the famous Les mollusques marins du Rousillon) and was interested in Mollusca himself. Paul Henri Fischer wrote his obituary in the Journal de Conchyliologie 114(3-4), p. 131. In this letter, Caspers asks for a copy of "Les copépodes parasites de mollusques", co-authored by Dollfus (1932), a work neither present in the library of the Zoologisches Institut in Hamburg, nor in the library of the Biologische Anstalt on Heligoland. Dollfus wrote in the left margin that he dispatched his offprints "104" and "135" on 23 January 1939; and added a note on 20 January 1951 (!) that he had asked Caspers for exchange of publications. Fold in the middle, otherwise very good.