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Check this site:
https://hesperian.org/books-and-resources/
You will find lots of stuff in various languages.
Take care, 'nando
Check this site:
https://hesperian.org/books-and-resources/
You will find lots of stuff in various languages.
Also this one:
https://www.communityledtotalsanitation.org/resource/handbook-community-led-total-sanitation
Take care, 'nando