BRIEF [O.A.] Gestro, Raffaello Author: Gestro, Raffaello Recipient: Haeckel, Ernst Dating: 19.01.1881
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.] Crisicopulo, Demetrio Author: Crisicopulo, Demetrio Recipient: Haeckel, Ernst Dating: 03.10.1881
BRIEF OHNE UMSCHLAG Recipient: Haeckel, Ernst Corporation: Oesterreichisch-Ungarischer Lloyd, Verwaltungsrath der Dampfschiffahrt-Gesellschaft Dating: 15.08.1881
BRIEF [O.A.] Montagne Brown, Yeats Author: Montagne Brown, Yeats Recipient: Haeckel, Ernst Dating: 17.01.1881
BRIEF [O.A.] Cattaneo, Giacomo Author: Cattaneo, Giacomo Recipient: Haeckel, Ernst Dating: 10.01.1881
BRIEF OHNE UMSCHLAG Krauseneck, Gustav Adolf Author: Krauseneck, Gustav Adolf Recipient: Haeckel, Ernst Dating: 12.09.1881