A map of the Gold Coast and inland countries between and beyond the Pra and Volta by the Basel Missionaries on the Gold Coast. Scale 1:300 000. Publishes by the Missionsbuchhandlung, Basel 1885 / G. K.
Dourisboure, Les sauvages Ba-Hnars. Souvenirs d'un Missionnaire. deuxième édition. Paris, J. Lecoffre 1875 / G. K.
Kestell-cornish, Journal of a tour of exploration in the north of Madagaskar 1876. With map and 5 illustrations from the Bishops sketches. London, Clay, Sons and Taylor 1877 / G. K.
N. Landmark, Fra Madagaskars Vestkyst. Udgivet af Selskabet for Folkeoplysingens fremme Kristiania, Groendahl & Soens Bogtrykkeri 1884 / G. K.