The most common and most likely answer to this crossword clue is the 4 letter word UFOS which also is the latest solution we found used in Newsday in 2013.
Topic of the USAF's Project Blue Book crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters |
|---|---|---|
| UFOS | 100 % | 4 |
Words with a meaning similar to the clue: Topic of the USAF's Project Blue Book
These words may or may not be a possible solution to this crosswords clue.- essay
- test
- bible
- style
- era
- subject
- exam
- square
- proctor
- dna
- loss
- field
Crossword Answer definitions
UFOS noun- A UFO.
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution