Butterflies of Marion County - Presents photos and species accounts of butterflies found within the county. - http://www.butterfliesandmoths.org/map?dc=156&_dcc=1&si=36
Marion County Environmental Data - Index to program areas, educational information, newsletters and events available through Ohio State University Extension. - http://marion.osu.edu/
Marion County Ground - Water Resources - Factsheet providing information on ground-water resources in the county. - http://ohioline.osu.edu/aex-fact/0490_51.html
Water Resources of Marion County - Factsheet providing information on water resources and drinking-water quality in the county. - http://ohioline.osu.edu/aex-fact/0480_51.html