Documentary-Drama films of the silent era:
Chang: A Drama in the Wilderness (1927)
In the Land of the Head Hunters (1915)
In the Land of the War Canoes (1914)
The Silent Enemy (1930)

Collections and boxsets that include silent era documentary films:
Dziga Vertov: The Man with the Movie Camera
and Other Newly-Restored Works (1924-1934)
World War I Films of the Silent Era (1916-1917)