Publication, 8: Ploughing implements and tillage practices in Denmark from the Viking period to about 1800 experimentally substantiated [ard, replica, pepples, ridges, plough marks, fossil fields]

agricultural development arados arados de rejas aradura charrue danemark denmark desgaste dinamarca histoire historia history labour labranza mechanical properties ploughing ploughs ploughshares soc tillage travail du sol trial methods uses usos usure utilisation wear