FRANKLYN T. AMISTAD; NORMA A. ESGUERRA; ALFREDO R. RABENA. Topographic Survey Comparison of Strategic Quarry Sites in Ilocos Sur. The Vector: International Journal of Emerging Science, Technology and Management (IJESTM), [S. l.], v. 6, n. 1, 1997. DOI: 10.69566/ijestm.v6i1.111. Disponível em: https://vector.unp.edu.ph/index.php/1/article/view/111. Acesso em: 19 sep. 2024.