| Undercover operations -- Fiction. Matches 57 items |
| Undercover operations -- Israel. Matches 1 item |
| Undercover operations -- Juvenile fiction. Matches 3 items |
| Undercover operations -- New Jersey. Matches 1 item |
| Undercover operations -- New York (State) -- New York. Matches 1 item |
| Undercover operations -- United States -- Case studies. Matches 2 items |
| Undercover operations -- United States -- Drama. Matches 2 items |
| Underemployment -- Economic aspects -- United States. Matches 1 item |
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Undergarments -- Juvenile fiction. SEE: Underwear -- Juvenile fiction Matches 1 item
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Undergraduates -- Comic books, strips, etc. SEE: College students -- Comic books, strips, etc Matches 2 items
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