BRIEF OHNE UMSCHLAG López Seoane, Victor Author: López Seoane, Victor Recipient: Haeckel, Ernst Dating: 17.01.1881
BRIEF [O.A.] Bell, Francis Jeffrey Author: Bell, Francis Jeffrey Recipient: Haeckel, Ernst Corporation: British Museum (Natural History) Dating: 02.07.1881
BRIEF [O.A.] Ricotti, Ercole Author: Ricotti, Ercole Recipient: Haeckel, Ernst Corporation: Accademia Reale delle Scienze di Torino Dating: 04.02.1881
BRIEF [O.A.] Bates, Geo... A... Author: Bates, Geo... A... Recipient: Haeckel, Ernst Dating: 13.06.1881
BRIEF OHNE UMSCHLAG Allmers, Hermann Author: Allmers, Hermann Recipient: Haeckel, Ernst Dating: 02.02.1881