TY - BOOK AU - Bureau of Indian Standards TI - Guide for Defluoridation of Water for Drinking Purposes ( Chemical Treatment Method ) (IS : 12742 - 1989) U1 - IS : 12742 - 1989 PY - 1990/// CY - New Delhi PB - Bureau of Indian Standards KW - Indian Standard - IT N1 - IS : 12742 - 1989 ER -