E. H. Helmer

Aluminum geochemistry in peatland waters

Steven J. Eisenreich, E. Helmer, N. Urban, 1990 .

Forest conservation and land development in Puerto Rico

E. Helmer, E. H. Helmer, 2004, Landscape Ecology.

The Landscape Ecology of Tropical Secondary Forest in Montane Costa Rica

E. Helmer, E. H. Helmer, 2000, Ecosystems.

Effects of chlorine and ammoniac from wastewater treatment facilities on biotic integrity

E. Helmer, E. H. Helmer, J. R. Kaar, 1985 .