Kenneth Chukwuemeka Omireh, Herbert Okechukwu Stanley and John Ugbebor (2025) “DETERMINATION OF THE HEAVY-METALS POLLUTION INDEX (HPI) OF GROUNDWATER SYSTEM NEAR SELECTED WASTE DUMPSITES IN PORT HARCOURT”, International Journal of Innovations in Engineering Research and Technology, 12(2), pp. 1–14. doi:10.26662/ijiert.v12i2.pp1-14.