1980
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Hace 20 horas · In addition, the sediment records show an increase in the human influence on the local vegetation, with hemp pollen values starting to rise from about 3000 cal BP (i.e. 1050 B.C.) onwards, and reaching their earliest peak during the 1st century A.D., as a clear consequence of the cultivation of hemp by the Romans, although the pre-Roman trends can be attributed to natural sources, and possibly ...
