ABUBAKAR, R. A. DESIGN AND FABRICATION OF A PORTABLE DRILLING RIG FOR AGRICULTURAL IRRIGATION BOREHOLES. Journal of Engineering & Technological Advances , [S. l.], v. 11, n. 1, p. 1-23, 2026. DOI: 10.35934/segi.v11i1.135. Disponível em: https://jeta.segi.edu.my/index.php/segi/article/view/135. Acesso em: 11 sep. 2026.