00390nam a2200145Ia 4500008004100000020001500041082001600056100002200072245003900094260004000133300000800173650001800181650001800199653002700217170901s1993    xx            000 0 und d  a8170416825  a574.5bT79T  aTrivedi, Dr. R.N. 0aTextbook of Environmental Sciences  aNew DelhibAnmol Publicationsc1993  a410  aLife sciences  aPure Sciences  aEnvironmental sciences