BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Carneri, Bartholomäus von Dating: 06.11.1880
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Allmers, Hermann Dating: 24.06.1880
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Deubler, Konrad Dating: 24.06.1880
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Rodenberg, Julius Dating: 05.05.1880
ZIRKULARBRIEF Haeckel, Ernst Author: Haeckel, Ernst Recipient: Snell, Karl; Schmid, Ernst Erhard [et al.] Dating: 01.02.1880
BRIEF OHNE UMSCHLAG Geuther, Anton Author: Geuther, Anton Recipient: Geuther, Anton Dating: 12.01.1880