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	1		Acidic precipitation : volume 4: soils, aquatic processes, and lake acidification / edited by S. A. Norton, S. E. Lindberg, A. L. Page . — New York : Springer-Verlag, [1990]. — 293 p. : tab., gráf. ; 24 cm. — ( Advances in environmental science ; vol. 4)
	2		Gaseous pollutants : characterization and cycling / edited by Jerome O. Nriagu . — New York : John Wiley & Sons, [1992]. — 548 p. : il., tab., gráf. ; 25 cm. — ( Advances in environmental science and technology ; 24)