IQBAL, M. “?CHROMIUM IN SEDIMENT OF THE MOVING STREAM OF TANNERY WASTE- FROM SECTOR 7-A OF KORANGI INDUSTRIAL AREA TO ARABIAN SEA”. Biological Sciences - PJSIR, vol. 38, no. 1, Jan. 1995, pp. 1-4, https://v2.pjsir.org/index.php/biological-sciences/article/view/2421.