A Century of Forest Resources Education at Penn StateHenry D. Gerhold · First published 2007Open the Tome
Compatible treeHenry D. Gerhold, Willet N. Wandell, Norman L. Lacasse · First published 2001Open the Tome
Street tree factsheets, 1989Henry D. Gerhold, Willet N. Wandell, Norman L. Lacasse, Richard D. Schein · First published 1989Open the Tome
Selecting and growing better landscape trees for northeastern United StatesHenry D. Gerhold · First published 1979Open the Tome
Effect of air pollution on Pinus strobus L. and genetic resistanceHenry D Gerhold · First published 1977Open the Tome
Better trees for metropolitan landscapesHenry D. Gerhold, Silas Little · First published 1976Open the Tome
