http://www.npwrc.usgs.gov
http://www.biosurvey.ou.edu/shrub/rosa-ark.htm
http://naturenorth.com
http://lib.ksu.edu/wildflower/arkansasrose
http://www.ag.uiuc.edu/~vista/html_pubs/WEEDS/107.html
Selected
North Dakota and Minnesota.
Range Plants by Kevin K. Sedivec and William T. Barker
NDSU Extemsion
Services. Fargo, ND
Restoring
the Tallgrass Prairie. An illustrated manual for Iowa and the upper
midwest by Shirley Shirley
Iowa City:
University of Iowa Press. 1994
Kathleen Brokke,
Interview. January 2002