National Wildlife Refuge Bird Checklists - Seasonal checklists for Bombay Hook NWR and Dover Air Force Base. - http://www.npwrc.usgs.gov/resource/birds/chekbird/r5/10.htm
Delaware Birding Locations - Checklist and site guides to 21 of the best birding spots in Delaware by Maurice Barnhill. - http://www.physics.udel.edu/~barnhill/Birdhtml/delloc2.html