some books:
African Faces by Hugo Maertens
Magische maskers. Afrikaanse maskers ut het Musée de l'Homme, paris by Ndiaye, Francine
the collector's guide to masks by Timothy Teuten
Afrikanische Masken by Elite
African Masks: from the Barbier-Mueller Collection
Art Of African Masks by Finley, Carol
and you can ask these museums:
https://new.artsmia.org/programs/tea...nd-masquerades
https://amsterdam.wereldmuseum.nl/en
https://www.africamuseum.be/en
courses:
https://study.com/academy/lesson/afr...s-history.html
https://www.artyfactory.com/africanmasks/index.htm
so good luck or as they say in your country..Go n-éirí leat !☼