Sumerians and Babylonians

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Across
  1. 2. ____ 60
  2. 4. Babylonian tablet
  3. 5. Ancient writing system in Mesopotamia
  4. 7. Earliest civilization in Mesopotamia
Down
  1. 1. Creators of Plimpton 322
  2. 3. System that dates back to 4000 BC
  3. 6. Within Tigris-Euphrates river