BRIEF OHNE UMSCHLAG Engwer, Theodor; Kalkowski, Kurt Julius Author: Engwer, Theodor; Kalkowski, Kurt Julius Recipient: Haeckel, Ernst Dating: 12.02.1906
BRIEF OHNE UMSCHLAG Schillings, Carl Georg Author: Schillings, Carl Georg Recipient: Haeckel, Ernst Dating: 27.12.1906
BRIEF OHNE UMSCHLAG Schillings, Carl Georg Author: Schillings, Carl Georg Recipient: Haeckel, Ernst Corporation: Monopol-Hotel Louis Schaurté Dating: 04.12.1906
BRIEF OHNE UMSCHLAG Stern, Eugen Author: Stern, Eugen Recipient: Haeckel, Ernst Corporation: Concert-Direction Eugen Stern Dating: 04.01.1906
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 01.03.1906
BRIEF OHNE UMSCHLAG Sachs, Jules Author: Sachs, Jules Recipient: Haeckel, Ernst Corporation: Concert-Direction Jules Sachs in Berlin Dating: 29.05.1906
BRIEF OHNE UMSCHLAG Hilbert, A. Author: Hilbert, A. Recipient: Haeckel, Ernst Corporation: Verlagsbuchhandlung Georg Reimer in Berlin Dating: 22.01.1906
BRIEF OHNE UMSCHLAG Schwarz, Arthur Author: Schwarz, Arthur Recipient: Haeckel, Ernst Dating: 03.02.1906