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Haufen [German]

In Prussia, 19ᵗʰ century, two units of capacity used for fuel. For fuelwood, the Haufen holf = 4½ Klafter, about 15.2504 cubic meters. For peat, the Haufen torf = 3 Klafter, about 13.0288 cubic meters.

Cl. de Laharpe.
Notes & Formules de L'Ingènieur et du Constructeur-Mècanicien. 7th ed.
Paris: E. Bernard & Cie. 1889.
Page 617.