| 11. | During the Bronze Age terraced field system, and an excavation pit.
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| 12. | In classical field theory, all field systems are the Lagrangian ones.
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| 13. | The wide field systems are separated by a 38 km baseline.
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| 14. | An open field system of farming prevailed in Thenford until the 18th century.
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| 15. | On its western flank are the remains of ancient settlements and field systems.
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| 16. | There is some disagreement about the age of the field system.
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| 17. | There is some evidence of a Bronze Age field system at the site.
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| 18. | Much of the area was cultivated under the open field system.
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| 19. | The equal-field system was introduced into practice around 485 AD by Tang dynasties.
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| 20. | The open-field system was never practised in all regions and countries in Europe.
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