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lass [Swedish]

In Sweden, a variety of units of mass used in trade in hay:

the lass = 40 lispund (about 340 kilograms), described in a royal resolution of 4 March 1774.
the sommarlass = 25 lispund (about 212.5 kilograms)
the vinterlass = 30 lispund (about 255 kilograms)