(to Hawk Mountain Sanctuary, its database and personalities )
DB1. Hickey, J. J. 1943. A guide to bird watching. Oxford University Press, Oxford, England. Pages 31-33 (Rosalie Edge, Maurice Broun, raptor migration, long-term raptor migration counts).
DB2. Spofford, W. R. 1969. Hawk Mountain counts as indices in Northeastern America. Pages 323-332 in J.J. Hickey, editor. Peregrine Falcon Populations. University of Wisconsin Press, Madison, Wisconsin.
DB3. Smith, R. J. 1984. Special report: the public benefits of private conservation. Pages 363-429 in Environmental quality: the 15th annual report of the Council on Environmental Quality. Government Printing Office, Washington, D. C.