BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 25.08.1878
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 25.03.1894
BRIEF OHNE UMSCHLAG Ritter, Paul von Author: Ritter, Paul von Recipient: Haeckel, Ernst Dating: 02.02.1891
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 21.03.1901
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 21.06.1889
BRIEF OHNE UMSCHLAG Becker, Franz Johann Jakob Emil Author: Becker, Franz Johann Jakob Emil Recipient: Haeckel, Ernst Dating: 20.03.1908
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 10.01.1912
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 17.04.1909
BRIEF OHNE UMSCHLAG Rottenburg, Paul Author: Rottenburg, Paul Recipient: Haeckel, Ernst Dating: 10.01.1912
BRIEF OHNE UMSCHLAG Quillet, Aristide Author: Quillet, Aristide Recipient: Haeckel, Ernst Dating: 26.12.1912