Geosystems CoreRobert W. Christopherson, Stephen Cunha, Charles E. Thomsen, Ginger Birkeland · First published 2016Open the Tome
Elemental geosystemsRobert W. Christopherson, Christopherson · First published 1995 · Latest edition 2013Open the Tome
Applied Physical GeographyRobert Christopherson · First published 1998 · Latest edition 2005Open the Tome
Geosystems an Introduction to Physical Geography Student Study GuideRobert W. Christopherson · First published 2002Open the Tome
