Bridgman, H. A. Global air pollution problems for the 1990s. John Wiley and Sons.
Dyfyniad Arddull ChicagoBridgman, Howard A. Global Air Pollution Problems for the 1990s. John Wiley and Sons.
Dyfyniad MLABridgman, Howard A. Global Air Pollution Problems for the 1990s. John Wiley and Sons.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.