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Butterflies of Highland County
http://www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/chklist/states/counties/oh_71.htm
Presents photos and species accounts of butterflies found within the county.
Highland County Environmental Data
http://ohioline.osu.edu/cd-fact/en_high.html
Environmental information for developers.
Highland County Ground-Water Resources
http://ohioline.osu.edu/aex-fact/0490_36.html
Factsheet providing information on ground-water resources in the county.
Water Resources of Highland County
http://ohioline.osu.edu/aex-fact/0480_36.html
Factsheet providing information on water resources and drinking-water quality in the county.