1. Impact of acid precipitation on forest and freshwater ecosystems in Norway,1976
2. A study of a Northern Michigan Snowpack;Cadle;Water, Air, Soil Pollut.,1983
3. The use of pentane to separate filled and empty sugar maple samaras;Carl;Tree plant Notes,1969
4. Acid snowpack chemistry in Pennsylvania, 1979–1981;Dewalle;Water Res. Bull.,1983
5. Acid snowpack chemistry in Pennsylvania, 1979–1981;Dewalle;Water Res. Bull.,1983