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  1. Plough - Wikipedia

  2. Plow | Description, History, Types, & Facts | Britannica

  3. History of the Plough

  4. FMP 211 :: Lecture 05

  5. Ridge and furrow - Wikipedia

  6. Plow - New World Encyclopedia

  7. What is Ploughing in Agriculture: Different Types of Plough

  8. Conventional Ploughs: History and Operation – GrowerExperts

  9. New evidence for prehistoric ploughing in Europe