Geologic map
Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania
Open-File Report 2013-1306: Geologic Map of Oldonyo Lengai (Oldoinyo Lengai) Volcano and Surroundings, Arusha Region, United Republic of Tanzania, by David R. Sherrod, Masota M. Magigita, and Shimba Kwelwa.