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Butterflies of Mercer County
http://www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/chklist/states/counties/oh_107.htm
Presents photos and species accounts of butterflies found within the county.
Mercer County Environmental Data
http://ohioline.osu.edu/cd-fact/en_merc.html
Environmental information for developers.
Mercer County Ground-Water Resources
http://ohioline.osu.edu/aex-fact/0490_54.html
Factsheet providing information on ground-water resources in the county.
Water Resources of Mercer County
http://ohioline.osu.edu/aex-fact/0480_54.html
Factsheet providing information on water resources and drinking-water quality in the county.