Manalang, M. F., Ocampo, G. ., Alonto, A.-S. . and Rimocal, G. . (2023) “GEO-SPATIAL MAPPING OF IRON (FE) AND MANGANESE (MN) PRESENT IN GROUNDWATER OF CLARK, PHILIPPINES”, ASEAN Engineering Journal, 13(1), pp. 101-107. doi: 10.11113/aej.v13.18432.