"Army Corps of Engineers," pp. 68-74; "Customs Service," pp. 142-149; and "Forest Service," pp. 256-260 in A HISTORICAL GUIDE TO AMERICAN GOVERNMENT, edited by George Kurian (New York: Oxford University Press, 1998).
Dubnick 1998a (US Army Corps of Engineers)
Dubnick 1998b (US Customs Service)
Dubnick 1998c (US Forest Service)