BRIEF OHNE UMSCHLAG Freudenberg, Philipp Author: Freudenberg, Philipp Recipient: Haeckel, Ernst Dating: 18.07.1881
BRIEF OHNE UMSCHLAG Freudenberg, Philipp Author: Freudenberg, Philipp Recipient: Haeckel, Ernst Dating: 29.09.1881
BRIEF OHNE UMSCHLAG Freudenberg, Philipp Author: Freudenberg, Philipp Recipient: Haeckel, Ernst Dating: 26.09.1881