- Butterflies of Colusa County - List of butterfly species including descriptions and photographs by the Northern Prairie Wildlife Research Center of the US Geological Survey.
www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/chklist/states/counties/ca_11.htm
- CERES - Colusa County - An index to environmental information for the county. Extensive reference includes road, weather, and flood conditions, demographics, historical resources, maps.
ceres.ca.gov/geo_area/counties/Colusa
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