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.] Magalhaes, Alves de Author: Magalhaes, Alves de Recipient: Haeckel, Ernst Dating: 06.11.1905
BRIEF [O.A.] Magalhaes, Alves de Author: Magalhaes, Alves de Recipient: Haeckel, Ernst Dating: 02.12.1905
BRIEF OHNE UMSCHLAG Lello, José Pinto de Souza; Lello, Antonio Author: Lello, José Pinto de Souza; Lello, Antonio Recipient: Haeckel, Ernst Corporation: Livraria Chardron Lello & Irmao Dating: 18.02.1909
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