Fig. 3
From: Ernst Haeckel, Nikolai Miklucho-Maclay and the racial controversy over the Papuans
Portrait of Maclay in Weimar (Germany). Photo with his signature (on the backside) as a present to Petr Semenov, 1870. RGO, File 6, List 3, № 20
Fig. 3 | Frontiers in Zoology