| United States -- Civilization -- 1970- Matches 52 items |
| United States -- Civilization -- 1970- -- Encyclopedias. Matches 4 items |
| United States -- Civilization -- 19th century. Matches 16 items |
| United States -- Civilization -- 20th century. Matches 44 items |
| United States -- Civilization -- 20th century -- Encyclopedias. Matches 1 item |
| United States -- Civilization -- 20th century -- Fiction. Matches 1 item |
| United States -- Civilization -- 20th century -- Philosophy. Matches 1 item |
| United States -- Civilization -- 21st century. Matches 11 items |
| United States -- Civilization -- 21st century -- Encyclopedias. Matches 5 items |
| United States -- Civilization -- 21st century -- Forecasting. Matches 1 item |