Reconstructing the past

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Across
  1. 2. biographical and historical accounts
  2. 4. history the period were there were no written records
  3. 6. the stone which early men used regularly for needs
  4. 7. the father of history
Down
  1. 1. the huge stones which is found mostly in the burial sites
  2. 3. the investigation of the past
  3. 5. royal commands