BRIEF OHNE UMSCHLAG Benninghoven Author: Benninghoven Recipient: Haeckel, Ernst Corporation: Dr. med. Benninghoven & Messing Dating: 25.02.1894
BRIEF OHNE UMSCHLAG Bertheau, Georg Author: Bertheau, Georg Recipient: Haeckel, Ernst Dating: 15.02.1894
BRIEF [O.A.] Bardeleben, Karl von Author: Bardeleben, Karl von Recipient: Haeckel, Ernst Corporation: British Museum (Natural History) Dating: 21.04.1894
BRIEF OHNE UMSCHLAG Bedriaga, Jacques von Author: Bedriaga, Jacques von Recipient: Haeckel, Ernst Dating: 21.04.1894
BRIEF [O.A.] Baglioni, Conte Benedetto Author: Baglioni, Conte Benedetto Recipient: Haeckel, Ernst Dating: 16.02.1894
BRIEF OHNE UMSCHLAG Bölsche, Wilhelm Author: Bölsche, Wilhelm Recipient: Haeckel, Ernst Dating: 16.02.1894
BRIEF OHNE UMSCHLAG Bölsche, Wilhelm Author: Bölsche, Wilhelm Recipient: Haeckel, Ernst Dating: 03.08.1894
BRIEF OHNE UMSCHLAG Bölsche, Wilhelm Author: Bölsche, Wilhelm Recipient: Haeckel, Ernst Dating: ??.09.1894
