C. Larino R, M. Castañares J. The Effect of Pulang-Bato Spring on the Levels of Copper and Zinc at the Zone of Impact of the Spring and a Section of Butuanon River. IJSBAR [Internet]. 2019 Nov. 30 [cited 2024 Apr. 27];48(6):82-107. Available from: https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/10337