Harold W. Keller

TREE CANOPY RESEARCH AND STUDENT EXPERIENCES USING THE DOUBLED ROPE CLIMBING METHOD

Courtney M. Kilgore, Harold W. Keller, Sydney E. Everhart, 2008 .

Tree Canopy Biodiversity in Temperate Forests: Exploring Islands in the Sky `

Courtney M. Kilgore, Harold W. Keller, Sydney E. Everhart, 2009 .

Die Myxomyceten Deutschlands und des angtenzenden Alpenraumes unter besonderer Beruchsichtigung Osterreichs, Band 2, Physarales (The Myxomycetes of Germany and Its Bordering Alpine Areas with Special Attention to Austria, Vol. 2, Physarales)

Harold W. Keller, H. Neubert, K. Baumann, 1997 .