| Answer | Crossword Clue |
|---|---|
| UFOS | Subject of Project Blue Book |
| UFO | Project Blue Book subject |
| UFOS | Project Blue Book subject |
| UFOS | Project Blue Book subject (4) |
| UFOS | Topic of the USAF's Project Blue Book |
| UFO | Project Blue Book subj. |
| Answer | Crossword Clue |
|---|---|
| UFOS | Subject of Project Blue Book |
| UFO | Project Blue Book subject |
| UFOS | Project Blue Book subject |
| UFOS | Project Blue Book subject (4) |
| UFOS | Topic of the USAF's Project Blue Book |
| UFO | Project Blue Book subj. |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.