C. I., O., J. A., O. and J. S., A. 2018. Investigation of Herbicides Presence in Surface Waters in Obubra Town, Cross River State, Nigeria. International Journal of Social Science and Economics Invention. 1, 04 (May 2018), 193 to 204. DOI:https://doi.org/10.23958/ijssei/vol01-i04/01.