Aligning with Maat: Archaeoastronomy & the Spiritual-Scientific Architecture of Kmt 
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(1991) Indigenous Soil and Water Conservation (SWC) in Africa
https://www.ircwash.org/sites/default/files/276-91IN-9927.pdf
inventory of farming systems with soil conserving practices. In 29 out of 52 examples, terracing and irrigation farming are practised. The major value of this table is that it clearly shows that African indigenous SWC techniques are not an exception; they are applied over large parts of the continent.
