Crossword puzzle clue "project blue book subject"

Here are the possible solutions for project blue book subject clue

Answer
Clue
Relevancy
ufo
Clue
Project Blue Book subject
1950s Project Blue Book subject, for short
Project Blue Book subj.
ufos
Clue
Project Blue Book subject
Topic of the USAF's Project Blue Book
abomb
Clue
Manhattan Project project
Manhattan Project project, informally
ara
Clue
Project ___ (Google modular smartphone project)

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