Environmental Impact Assessment in the United StatesRobert M. Sanford, Donald G. Holtgrieve · First published 2022Open the Tome
The geography of North AmericaSusan Wiley Hardwick, Susan W. Hardwick, Fred M. Shelley, Donald G. Holtgrieve · First published 2007Open the Tome
Geography for educatorsSusan Wiley Hardwick, Donald G. Holtgrieve · First published 1995Open the Tome
