Norma A. Esguerra, Franklyn T. Amistad, and Alfredo R. Rabena. 2008. “Characterizing the Environmental Effects of the Quarrying Industry: The Case of Strategic Quarry Sites in the Ilocos Region”. The Vector: International Journal of Emerging Science, Technology and Management (IJESTM) 17 (1). https://doi.org/10.69566/ijestm.v17i1.215.