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three features of common-field systems:
1) the open fields
2) practice of common pasture on the stubble and fallow
3) regulation of cropping, grazing, other farm management *by an assembly of cultivators.*

i think the last may be very important. #EverySocietySelectsForSomething
where communal field systems were found [hoffman, pg. 27]:
the communal field systems of nw "core" europe pushed strongly for cooperation and conformity. this among comparatively unrelated, outbred families remember. [hoffman, pg. 31 books.google.com/books?id=0pB9B…]:
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