The Design and Implementation of laffer1

http://www.ohiodnr.com/wildlife/resources/amphibians/easternamtoad.htm
http://www.seagrant.wisc.edu/frogs/american_toad.html
http://vernalpools.rtpi.org/guides/species.htm?species_id=20
http://www.michigan.gov/cgi/0,1607,7-158-10370_12145_12201-60111--,00.html