BEAM, H.E. A Study For The Revision Of Ninth Grade Agriculture. Journal of Agricultural Education, [S. l.], v. 2, n. 1, p. 28–29, 1961. DOI: 10.5032/jaatea.1961.01028. Disponível em: https://jae-online.org/index.php/jae/article/view/1632. Acesso em: 14 sep. 2024.