BRIEF OHNE UMSCHLAG Bendrat, Thomas Albert Author: Bendrat, Thomas Albert Recipient: Haeckel, Ernst Dating: 03.11.1907
BRIEF OHNE UMSCHLAG Doubleday, Russell Author: Doubleday, Russell Recipient: Scheffauer, Herman Corporation: Doubleday Page & Co., The Country Life Press Dating: 18.02.1916
BRIEF OHNE UMSCHLAG Robinson, Victor Author: Robinson, Victor Recipient: Haeckel, Ernst Corporation: Medical Review of Reviews Dating: 28.06.1912