Spatial and historical trends in acidic deposition: A graphical intersite comparisonM. Nosal · 1967

Spatial and historical trends in acidic deposition: A graphical intersite comparisonElmar R Altwicker · 1967

The integrated lake-watershed acidification study: Atmospheric inputsArland H. Johannes; Elmar R. Altwicker; Nicholas L. Clesceri · 1985