Check out Professor Ferreira's Ethnomathematics Memoir

Professor Ferreira's Ethnomathmatics Memoir is available in both English and Spanish:

 

Stars in the Sky: Pleiades Invite Plenitude -- an Ethnomathematics Memoir in Central Brazil. 

https://periodicos.ufop.br:8082/pp/index.php/revemop/article/view/3528/3156

 

Estrellas en el Cielo: las Pléyades invitan a la Plenitud -- una memoria etnomatemática en el centro de Brasil.