Envirothon homepage: http://www.envirothonpa.org/
Aquatics Resources
https://www.paherps.com/herps/frogs-toads/
Soils resources
https://www.fao.org/3/R4082E/r4082e03.htm#2.1
https://www.nrcs.usda.gov/
Forestry Resources
https://www.envirothonpa.org/documents/2011_CommonTreesBooklet.pdf
https://www.dcnr.pa.gov/Education/Envirothon/Pages/default.aspx
Wildlife Resources
https://www.pgc.pa.gov/Education/ForEducators/Pages/default.aspx