BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Gegenbaur, Carl Dating: 12.11.1866
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 27.06.1890
BRIEF [O.A.] Lima, Maghalhaes Author: Lima, Maghalhaes Recipient: Haeckel, Ernst Corporation: Republica Portugueza Dating: 02.12.1912
BRIEF [O.A.] Bethencourt Ferreira, J... Author: Bethencourt Ferreira, J... Recipient: Haeckel, Ernst Corporation: Universidade de Lisboa, Faculdade de Sciencias, Museu Bocage Dating: 16.10.1913
BRIEF [O.A.] Bethencourt Ferreira, J... Author: Bethencourt Ferreira, J... Recipient: Haeckel, Ernst Corporation: Universidade de Lisboa, Faculdade de Sciencias, Museu Bocage Dating: 04.11.1913
BRIEF [O.A.] Barboye du Bocage, José Vicente Author: Barboye du Bocage, José Vicente Recipient: Haeckel, Ernst Dating: 26.12.1870
BRIEF OHNE UMSCHLAG Barboye du Bocage, José Vicente Author: Barboye du Bocage, José Vicente Recipient: Haeckel, Ernst Dating: 20.12.1873
BRIEF [O.A.] Bombarda, Miguel Author: Bombarda, Miguel Recipient: Haeckel, Ernst Corporation: Hospital de Rilhafolles Dating: 13.03.1898
BRIEF [O.A.] Bombarda, Miguel Author: Bombarda, Miguel Recipient: Haeckel, Ernst Corporation: Hospital de Rilhafolles Dating: 08.04.1898