BRIEF [O.A.] Schultze, Leonhard Author: Schultze, Leonhard Recipient: Haeckel, Ernst Dating: 06.01.1904
BRIEF OHNE UMSCHLAG Schultze, Leonhard Author: Schultze, Leonhard Recipient: Haeckel, Ernst Dating: 27.08.1903
BRIEF OHNE UMSCHLAG Schultze, Leonhard Author: Schultze, Leonhard Recipient: Haeckel, Ernst Dating: 06.01.1904