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 L. O.  Hedin, et al., ?Steep declines in atmospheric base cations in regions of Europe and North America?, Nature, vol. 367, p. 351-354, 1994.\par \par  L. O.  Hedin, L.  Granat, G. E.  Likens, and H.  Rodhe, ?Strong similarities in seasonal concentration ratios of SO42-, NO3- and NH4+ in precipitation between Sweden and the northeastern United States?, Tellus, vol. 42B, p. 454-462, 1990.\par \par  J. M.  Prospero, et al., ?The deposition of sulfur and nitrogen from the remote atmosphere working-group report?, in J. N. Galloway, R. J. Charlson, M. O. Andreae, and H. Rodhe (eds.). The Biogeochemical Cycling of Sulfur and Nitrogen in the Remote Atmosphere. Bermuda Biological Station, Bermuda, 1985, p. 177-200.\par \par }