Crossword puzzle clue "1950s project blue book subject for short"

Here are the possible solutions for 1950s project blue book subject for short clue

Answer
Clue
Relevancy
ufo
Clue
1950s Project Blue Book subject, for short
Project Blue Book subject
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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