Sokha (big plow) [1] – a unit of land measure in Russia in 13th-17th centuries. Sokha was used as unit of taxation for worked land owned by someone else or the State. The term originated when Tatars took rent from the actual plows - the land working tool which used 2-3 horses.. At the end of 15th century Novgorod sokha equalled 3 обжs(obhzs). A Moscow sokha was equal to 10 Novgorod ones ... More @Wikipedia
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