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This site also has a lot of resources about lesser known crops, although the charity behind it seems to have fallen on hard times.

https://pfaf.org/

As an aside, cassava is not native to Africa - like potatoes & maize, it originated in the Americas and made it to the old world as a result of European contact.

@c4rat0n1a:
Thanks for the link.

Interesting fact about cassava. I am still astonished how many everyday crops come from the Americas that nearly every country in the world uses.