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- ?, J. M. G. van der Poel, "Agriculture in Pre- and Protohistoric Times", in the Acta Historiae Neerlandica published by the Netherlands Committee of Historical Sciences, page 170:
- The terp farmer made use of the plough, as is shown by the discovery of three ploughshares and four coulters. [...] Those who inclined to the stock-breeding theory based their arguments on the absence of ploughs, [...]. To return to Holland, arable land and wheat and barley seeds have been found in the terp at Firdgum (Friesland) which is near the sea [...].
— Beobach 03:34, 11 December 2010 (UTC)