BRIEF OHNE UMSCHLAG Beck, Albert (Alberto) Author: Beck, Albert (Alberto) Recipient: Haeckel, Ernst Corporation: Mineral de San Sebastian Dating: 25.01.1902
ANSICHTSKARTE Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 03.03.1910
TELEGRAMM Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 16.02.1910
BRIEF [O.A.] Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 02.03.1909
BRIEF [O.A.] Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 01.??.1909
POSTKARTE Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 02.03.1909
POSTKARTE Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 16.02.1909
BRIEF [O.A.] Rovirosa, F... Lacroix Author: Rovirosa, F... Lacroix Recipient: Haeckel, Ernst Dating: 29.09.1909
BRIEF [O.A.] Herrera, Alfonso L... Author: Herrera, Alfonso L... Recipient: Haeckel, Ernst Corporation: Museo Nacional Dating: 19.10.1895
