BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 20.12.1892
BRIEF OHNE UMSCHLAG Bonham Carter, Walter Henry Author: Bonham Carter, Walter Henry Recipient: Haeckel, Ernst Dating: 14.02.1892
BRIEF OHNE UMSCHLAG Bennett, Alfred H. Author: Bennett, Alfred H. Recipient: Haeckel, Ernst Corporation: The Arts Society Dating: 08.03.1892