Gateways to commerce :
the U.S. Army Corps of Engineers' 9-foot channel project on the Upper Mississippi River /
William Patrick O'Brien, Mary Yeater Rathbun, Patrick O'Bannon ; edited by Christine Whitacre.

APA Citation

O'Brien, W. Patrick., Whitacre, C., O'Bannon, P., Rathbun, M. Yeater., United States. Army. Corps of Engineers., United States. National Park Service. Rocky Mountain Regional Office. (1992). Gateways to commerce: the U.S. Army Corps of Engineers' 9-foot channel project on the Upper Mississippi River. Denver, Colo.: National Park Service, Rocky Mountain Region .

MLA Citation

United States. National Park Service. Rocky Mountain Regional Office, et al.. Gateways to Commerce: the U.S. Army Corps of Engineers' 9-foot Channel Project On the Upper Mississippi River. Denver, Colo.: National Park Service, Rocky Mountain Region , 1992.