Lost children of WWII

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Across
  1. 2. amount of days 1.5 million evacuees where relocated
  2. 3. the child who sent the letter home?
  3. 5. Where the kids where sent?
  4. 6. Who was this main topic about?
  5. 7. masks Used to protect from harmful toxins?
Down
  1. 1. polish social worker who smuggled kids out?
  2. 4. what where the children evacuating on?