POSTKARTE Herdman, William A... Author: Herdman, William A... Recipient: Haeckel, Ernst Corporation: University College Dating: 16.03.1891
POSTKARTE Herdman, William A... Author: Herdman, William A... Recipient: Haeckel, Ernst Corporation: University College Dating: 14.11.1891
POSTKARTE Herdman, William A... Author: Herdman, William A... Recipient: Haeckel, Ernst Corporation: L. M. B. C. and Port Erin Biological Station, University College Dating: 25.10.1901
POSTKARTE Herdman, William A... Author: Herdman, William A... Recipient: Haeckel, Ernst Dating: 24.12.1902
POSTKARTE Herdman, William A... Author: Herdman, William A... Recipient: Haeckel, Ernst Corporation: The University of Liverpool, Zoological Department Dating: 27.10.1904
POSTKARTE Herdman, William A... Author: Herdman, William A... Recipient: Haeckel, Ernst Dating: 12.11.1904