Fraelich, S. (2021). Soil Conservation in Africa (1–). https://oaks.kent.edu/node/18303
Fraelich, Samuel. 2021. “Soil Conservation in Africa”. https://oaks.kent.edu/node/18303.
Fraelich, Samuel. Soil Conservation in Africa. 20 Apr. 2021, https://oaks.kent.edu/node/18303.