North Dakota Birding Society - http://ndbirdingsociety.com 

South Dakota Ornithological Union - http://homepages.dsu.edu/palmerj/SDOU/SDOU.html

American Birding Association - http://www.americanbirding.org/

North Dakota Birding Checklists - http://www.npwrc.usgs.gov/resource/birds/chekbird/r6/38.htm

National Wildlife Refuges in ND - http://www.fws.gov/refuges/profiles/ByState.cfm?state=ND