Butterflies of Putnam County - Presents photos and species accounts of butterflies found within the county. www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/chklist/states/counties/oh_137.htm
Putnam Soil and Water Conservation District - Agency responsible for the protection of natural resources within the county that assists landowners in planning and applying conservation practices on their land. www.geocities.com/pswcd
Water Resources of Putnam County - Factsheet providing information on water resources and drinking-water quality in the county. ohioline.osu.edu/aex-fact/0480_69.html
