Another possibility for state park boundary shp files might be the Oklahoma Protected Areas Database at the Oklahoma Biological Survey. I have not seen this data; but I worked on the original public lands layer for the Oklahoma GAP project.
http://biosurvey.ou.edu/PAD/PAD.html "PAD-OK is an aggregated dataset, incorporating data as provided by land owners, administrators, or best available sources. Inconsistencies in data quality and scale may be present. Because of possible data inconsistencies, PAD-OK is best for landscape level analysis (1:100,000 or greater)..." Contact Todd Fagin: tfagin at ou dot edu for info. I hope this helps. Ian Butler _______________________________________________ Talk-us mailing list [email protected] https://lists.openstreetmap.org/listinfo/talk-us
