BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 15.02.1894
BRIEF OHNE UMSCHLAG Engelmann, Theodor Wilhelm Author: Engelmann, Theodor Wilhelm Recipient: Haeckel, Ernst Dating: 24.03.1894
BRIEF OHNE UMSCHLAG Mulder, Lodewijk Author: Mulder, Lodewijk Recipient: Haeckel, Ernst Dating: 15.02.1894
TELEGRAMM Hubrecht, Ambrosius Author: Hubrecht, Ambrosius Recipient: Haeckel, Ernst Dating: 17.02.1894
TELEGRAMM Weber, Max; Weber van Bosse, Anna; Ruge, Georg; Ruge, Ernestine Author: Weber, Max; Weber van Bosse, Anna; Ruge, Georg; Ruge, Ernestine Recipient: Haeckel, Ernst Dating: 17.02.1894