http://www.ou.edu/cas/archsur/
The Oklahoma Archeological Survey
http://faculty-staff.ou.edu/D/Richard.R.Drass-1/
A map with the southern plains cultures that lived in Oklahoma 900-1400 A.D.
Good content for learning Oklahoma prehistory
http://www.ou.edu/cas/archsur/oas/
The Oklahoma Anthropological Society
With information on opportunities to join
http://www.ou.edu/cas/archsur/staff.htm
http://www.uiowa.edu/~osa/nasa/in/oklahoma.html
Contact information for the state archeologist