00350nam a2200121Ia 4500008004100000040003800041100001800079245005400097250000800151260003500159300001600194653001800210211217s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aAir Pollution 0aAir pollution vol 1 air pollution and its efforts  a2nd  bAcademic PressaNew Yorkc1970  axix,634p p.  aAir pollution