Obiekezie, S. O., J. N. Okereke, E. Anyalogbu, S. I. Okorondu, e T. I. N. Ezejiofor. 2006. “UNDERGROUND WATER QUALITY OF ROCK MINING IN ISHIAGU, EBONYI STATE, NIGERIA”. Estudos De Biologia 28 (63). https://doi.org/10.7213/reb.v28i63.22724.