کتاب های W. Ripper
A Field Guide to Southwestern and Texas Wildflowers
Theodore F. Niehaus, Roger Tory Peterson, Roger Tory Peterson, Virginia Savage, Charles L. Ripper, 1998
A Field Guide to Pacific States Wildflowers: Washington, Oregon, California and Adjacent Areas
Theodore F. Niehaus, Roger Tory Peterson, Charles L. Ripper, 1998
American Stories: Living American History, Volume I, To 1877
Jason Ripper, 2008
American Stories: Living American History, Volume II: From 1865
Jason Ripper, 2008
