| United States -- Boundaries. Matches 2 items |
| United States -- Boundaries -- Canada. Matches 1 item |
| United States -- Boundaries -- History. Matches 1 item |
| United States -- Boundaries -- Mexico. Matches 9 items |
| United States -- Boundaries -- Mexico -- Congresses. Matches 1 item |
| United States -- Boundaries -- Mexico -- History. Matches 1 item |
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United States. Brooks Air Force Base. SEE: Brooks Air Force Base (Tex.) Matches 1 item
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| United States. Bureau of Alcohol, Tobacco, and Firearms. Matches 2 items |
| United States. Bureau of Alcohol, Tobacco, and Firearms -- Officials and employees -- Biography. Matches 1 item |
| United States. Bureau of Alcohol, Tobacco, and Firearms -- Officials and employees -- Fiction. Matches 2 items |
