Ижил төстэй зүйлс: These United States;
- History of the United States of America, from the discovery of the continent to 1789 /
- A Short history of the United States, 1492-1938
- United States foreing policy for the 1970's
- The United States Constitution
- The United States Constitution
- Hydrogeologic framework of stratifies-drift aquifers in the glaciated northeastern United States : regional aquifer-system analysis- northeastern United States /