BRIEF [O.A.] Dozamantes, Jesús Ceballos Author: Dozamantes, Jesús Ceballos Recipient: Haeckel, Ernst Dating: 23.08.1897
BRIEF OHNE UMSCHLAG Bentele, Elisbeth Author: Bentele, Elisbeth Recipient: Haeckel, Ernst Dating: 17.05.1901
BRIEF [O.A.] Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 27.09.1907
BRIEF [O.A.] Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 01.11.1907
BRIEF [O.A.] Herrera, Alfonso L... Author: Herrera, Alfonso L... Recipient: Haeckel, Ernst Corporation: Museo Nacional Dating: 19.10.1895
BRIEF [O.A.] Herrera, Alfonso L... Author: Herrera, Alfonso L... Recipient: Haeckel, Ernst Corporation: Secretaria de Fomento, Comision de Parasitologia Agricola Dating: 26.04.1906
BRIEF [O.A.] Herrera, Alfonso L... Author: Herrera, Alfonso L... Recipient: Haeckel, Ernst Corporation: Secretaria de Fomento, Comision de Parasitologia Agricola Dating: 19.06.1906
BRIEF [O.A.] Rio, Alejandro J... del Author: Rio, Alejandro J... del Recipient: Haeckel, Ernst Dating: 24.04.1905