Authors: Umar, A Umar, R Ahmad, MS

Citation: A. Umar et al., Hydrogeological and hydrochemical framework of regional aquifer system in Kali-Ganga sub-basin, India, ENVIR GEOL, 40(4-5), 2001, pp. 602-611

Authors: Umar, R Umar, A Khurshid, S Ahmad, I

Citation: R. Umar et al., Microbial contamination in the groundwater of Aligarh city, J GEOL S IN, 58(2), 2001, pp. 157-162

Authors: Umar, R Ahmad, MS

Citation: R. Umar et Ms. Ahmad, Groundwater quality in parts of Central Ganga Basin, India, ENVIR GEOL, 39(6), 2000, pp. 673-678