Oklahoma Master Naturalist - Central Chapter
Oklahoma Native Plant Society
Oklahoma Cooperative Extension Service
Oklahoma Master Gardener
Oklahoma Department of Wildlife Conservation
Oklahoma's State Symbols
Oklahoma Biological Survey
Oklahoma Geological Survey
Oklahoma Climatological Survey
Geocaching - GPS Cache Hunt Site
Astronomy Club of Tulsa
Critter Tales Inc.
Texas Master Naturalist
Oklahoma's History
Native Fish
Nature
Astronomy Picture of the Day
Oklahoma Agweather
eNature:America's Wildlife Resource
Oklahoma WildThings by Charles Lewallen
Oklahoma insect images
Butterflys and Moths of Oklahoma
The Oklahoma Centennial Botanical Garden/Research and Education Center
Sutton Avian Research Center
Chert Glades Naturalists Chapter, Joplin, MO
Oxley Nature Center