BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 08.06.1912
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 25.05.1916
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 04.08.1918
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 22.01.1909
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 03.05.1912
BRIEF OHNE UMSCHLAG Wende, ? Author: Wende, ? Recipient: Gruyter, Walter de Corporation: Meisenbach Riffarth & Co. Graphische Kunstanstalten Berlin Dating: 19.05.1905
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 25.04.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 03.06.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 17.06.1919