The U.S. Army Corps of... bookstore.gpo.gov

Headquarters U.S. Army... www.usace.army.mil

United States Army Corps of... en.wikipedia.org

The U.S. Army Corps of... www.amazon.com

Headquarters U.S. Army... www.usace.army.mil

U.S. Army Corps of... www.usace.army.mil

Headquarters U.S. Army... www.usace.army.mil

The History of the U.S.... www.amazon.com

History Publications www.usace.army.mil

What's the Army Corps of... empireresume.com

Headquarters U.S. Army... www.usace.army.mil

Headquarters U.S. Army... www.usace.army.mil

File:US-ArmyCorpsOfEngineer... commons.wikimedia.org

Headquarters U.S. Army... www.usace.army.mil

United States Army Corps of... en.wikipedia.org

History Publications www.usace.army.mil

History Publications www.usace.army.mil

File:US-ArmyCorpsOfEngineer... commons.wikimedia.org

US ARMY CORPS OF ENGINEERS... www.fortamerica.com

The History of the U.S.... www.amazon.com