three-field system
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crop rotation
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Europe
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Middle Ages
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wheat
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International Standard Book Number
Entity
cereal
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Avena sativa
Entity
plough
Entity
Pisum sativum
Entity
Secale cereale
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Lens culinaris
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field
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bean
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legume
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horseshoe
Entity
arable land
Entity
nitrogen fixation
Entity
fallow
Entity
grazing
Entity
University of Houston
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