BRIEF OHNE UMSCHLAG McCabe, Joseph Author: McCabe, Joseph Recipient: Haeckel, Ernst Dating: ??.08.1905
BRIEF OHNE UMSCHLAG McCabe, Joseph Author: McCabe, Joseph Recipient: Haeckel, Ernst Dating: 18.11.1905
BRIEF OHNE UMSCHLAG McCabe, Joseph Author: McCabe, Joseph Recipient: Haeckel, Ernst Dating: 28.12.1905
BRIEF OHNE UMSCHLAG Leeden, Carl van der Author: Leeden, Carl van der Recipient: Haeckel, Ernst Dating: 07.04.1905
BRIEF OHNE UMSCHLAG Krauseneck, Gustav Adolf Author: Krauseneck, Gustav Adolf Recipient: Haeckel, Ernst Dating: 13.07.1905
BRIEF OHNE UMSCHLAG Krauseneck, Gustav Adolf Author: Krauseneck, Gustav Adolf Recipient: Haeckel, Ernst Dating: 21.11.1905
BRIEF OHNE UMSCHLAG Krüche, Raimund Author: Krüche, Raimund Recipient: Haeckel, Ernst Dating: 15.02.1905