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Astronomical Society of East Texas
http://aset.tamu.edu/
Meeting information, news, contacts and link to Tyler-specific seeing forecast.
Discovery Science Place
http://www.discoveryscienceplace.com/
Hands-on science museum for kids of all ages.
East Texas Chapter, Texas Master Naturalists
http://woodduck.org/
Calendar, program overview, news and application.
East Texas Geological Society
http://www.easttexasgeo.com/
News, officers, meetings, publications, bulletin board and membership information.
Native Plant Society of Texas - Tyler Chapter
http://www.npsot.org/Tyler/
Meeting and contact information, along with newsletter archive.
Tyler Audubon Society
http://www.tyleraudubon.org/
Programs, newsletter, officers, field trips and East Texas birding locations.