The new activities handbook for energy educationAlfred De Vito, Gerald H. Krockover · First published 2000Open the Tome
Harcourt scienceMarjorie Frank, Robert M. Jones, Gerald H. Krockover, Mozell P. Lang, Joyce C. McLeod, Carol J. Valenta, Barry A. Van Deman, JONES, KROCKOVER, FRANK · First published 1999Open the Tome
Creative sciencingAlfred De Vito, Alfred Devito, Gerald H. Krockover · First published 1976Open the Tome
Creative Sciencing - Ideas and Activities for Teachers and ChildrenGerald H. Krockover Alfred DeVito · First published 1976Open the Tome
