BRIEF OHNE UMSCHLAG Claus, Rudolph Moritz Author: Claus, Rudolph Moritz Recipient: Haeckel, Ernst Dating: 02.03.1872
BRIEF OHNE UMSCHLAG Claus, Rudolph Moritz Author: Claus, Rudolph Moritz Recipient: Haeckel, Ernst Dating: 03.03.1872
BRIEF OHNE UMSCHLAG Claus, Rudolph Moritz Author: Claus, Rudolph Moritz Recipient: Haeckel, Ernst Dating: 20.03.1872
BRIEF OHNE UMSCHLAG Claus, Rudolph Moritz Author: Claus, Rudolph Moritz Recipient: Haeckel, Ernst Dating: 15.02.1872