WW2 crytographer training

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Across
  1. 2. Librarian travel destination 2023
  2. 5. English translation of ‘Hayati’
  3. 6. Dewey main category for 300-399
Down
  1. 1. Company that manufactures barbie dolls
  2. 3. J. Robert Oppenheimer is the father of the ____ bomb
  3. 4. “The ___ is now”
  4. 5. A place that contains collections of books