» Butterflies of Highland County Presents photos and species accounts of butterflies found within the county. http://www.butterfliesandmoths.org/map?dc=460&_dcc=1&si=36
» Highland County Environmental Data Index to program areas, educational information, newsletters and events available through Ohio State University Extension. http://highland.osu.edu/
» Highland County Ground-Water Resources Factsheet providing information on ground-water resources in the county. http://ohioline.osu.edu/aex-fact/0490_36.html
» Water Resources of Highland County Factsheet providing information on water resources and drinking-water quality in the county. http://ohioline.osu.edu/aex-fact/0480_36.html
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