BRIEF [O.A.] Haberlandt, Gottlieb Author: Haberlandt, Gottlieb Recipient: Haeckel, Ernst Dating: 14.02.1904
BRIEF OHNE UMSCHLAG Schillings, Carl Georg Author: Schillings, Carl Georg Recipient: Haeckel, Ernst Dating: 20.08.1904
BRIEF OHNE UMSCHLAG Schillings, Carl Georg; Bölsche, Wilhelm Author: Schillings, Carl Georg; Bölsche, Wilhelm Recipient: Haeckel, Ernst Dating: 22.08.1904
BRIEF OHNE UMSCHLAG Schillings, Carl Georg Author: Schillings, Carl Georg Recipient: Haeckel, Ernst Corporation: Monopol-Hotel Louis Schaurté Dating: 24.08.1904
BRIEF OHNE UMSCHLAG Schillings, Carl Georg Author: Schillings, Carl Georg Recipient: Haeckel, Ernst Corporation: Monopol-Hotel Louis Schaurté Dating: 29.08.1904
BRIEF OHNE UMSCHLAG Schillings, Carl Georg Author: Schillings, Carl Georg Recipient: Haeckel, Ernst Corporation: Monopol-Hotel Louis Schaurté Dating: 17.11.1904