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substantial investment in feed and maintenance. That may not have been possible on a large scale until the Chalcolithic. For the same reason, beginning in the Chalcolithic, ownership of oxen probably began to define the differences haves and have-nots' [79
substantial investment in feed and maintenance. That may not have been possible on a large scale until the Chalcolithic. For the same reason, beginning in the Chalcolithic, ownership of oxen probably began to define the differences haves and have-nots' [79