Networks of exchange

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Across
  1. 4. Ocean Trade
  2. 5. of exchange
  3. 6. saddle
  4. 9. Polo
  5. 10. sail
  6. 11. winds
Down
  1. 1. Road
  2. 2. compass
  3. 3. money
  4. 5. Plague
  5. 7. erosion
  6. 8. cash
  7. 9. economy
  8. 12. rudder