Peern

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Peerne was a French unit of mass (measure of weight) for grain .

2 1/2 peern = 1 bushel (Berliner) (about 54 to 55 liters )
10 peers = 1 ton

literature

August Daniel von Binzer, Heinrich August Pierer: Encyclopaedic dictionary of the sciences, arts and trades. Volume 16, Hahn, Literatur-Comptoir, Altenburg 1831, p. 9.