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 Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Corporation: Zoologisches Institut der Universität Jena Dating: 29.01.1906
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 21.12.1905
BRIEF OHNE UMSCHLAG Recipient: Gruyter, Walter de Corporation: Dodd, Mead and Company Publishers Dating: 27.12.1915
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: 25.04.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gruyter, Walter de Dating: 03.06.1919