A Camera Actress in the Wilds of Togoland: The Adventures, Observations & Experiences of a Cinematograph Actress in West African Forests whilst Collecting Films Depicting Native Life and when Posing as the White Woman in Anglo-African Cinematograph Dramas. With an Introduction by Major H. Schomburgk. Philadelphia: J.B. Lippincott & London: Seeley, Service & Co. This is available on-line here
This is an interesting, well-illustrated memoir about the expedition led by Hans Schomburgk while making Im Deutschen Sudan, as well as an number of ethnodramas in which Miss Gehrts was the star. In 1996, a French translation was published by the Université du Bénin which can be read on-line here