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 Baker, Ray Stannard Author: Baker, Ray Stannard Recipient: Haeckel, Ernst Corporation: The S. S. McClure Co. Dating: 22.06.1900
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 Richet, Charles Author: Richet, Charles Recipient: Haeckel, Ernst Corporation: Revue Scientifique Dating: ??.08.1882
BRIEF OHNE UMSCHLAG Richet, Georges Author: Richet, Georges Recipient: Haeckel, Ernst Corporation: Societé d´Editions Litteraires & Artistiques Dating: 30.03.1907