rock art from Valcamonica in northern Italy includes ploughs with cattle which
have been interpreted as belonging to the 5th millennium BC.
You may also find this useful:
PIGGOTT, STUART. The Earliest Wheeled Transport from the Atlantic Coast to the
Caspian Sea. London, Thames and Hudson. 1983,
for guinea-pigs you may also want to look at:
1983 "Why on earth the guinea-pig?". En Site, Environment and Economy de B.
Proudfoot (editor), pp. 115-119. Oxford: BAR International Series.
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