BRIEF [O.A.] Pelet-Narbonne, Stephanie von Author: Pelet-Narbonne, Stephanie von Recipient: Haeckel, Ernst Dating: 29.02.1896
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 27.03.1878
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 30.03.1878
BRIEF OHNE UMSCHLAG Canaro, Antonio Author: Canaro, Antonio Recipient: Haeckel, Ernst Corporation: R. Istituto Veneto di Scienze, Lettere ed Arti Dating: 27.06.1899
BRIEF [O.A.] Domenichini, Mario Author: Domenichini, Mario Recipient: Haeckel, Ernst Dating: 20.02.1907
BRIEF [O.A.] Domenichini, Mario Author: Domenichini, Mario Recipient: Haeckel, Ernst Dating: 27.02.1907
BRIEF [O.A.] Domenichini, Mario Author: Domenichini, Mario Recipient: Haeckel, Ernst Dating: 31.05.1907