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Butterflies of Madison County
http://www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/chklist/states/counties/oh_97.htm
Presents photos and species accounts of butterflies found within the county.
Madison County Environmental Data
http://ohioline.osu.edu/cd-fact/en_madi.html
Environmental information for developers.
Madison Soil and Water Conservation District
http://www.mswcd.org/
Agency responsible for the protection of natural resources within the county that assists landowners in planning and applying conservation practices on their land.