The teachers Abraham and Petro with a class, Gonja, Tanzania, 1920

"Unterricht auf der Stationsschule Gonja mit den Lehrern Abraham und Petro" ("Lessons at Gonja station school with the teachers Abraham and Petro"). The two teachers and a class of boys and girls in a classroom. A blackboard and a map of Europe.; Cf. photo no. 42(571), album no. 7 and photos nos. 571, 572, 573, 574 and 575, album no. 5