Lothal was the only Indus Valley site with an artificial brick dockyard. Evidence of both Harappan and Pre-Harappan culture found in Kalibangan. Here agricultural fields were ploughed from early times. An inscription comprising ten large sized sign of the Harappan script was excavated from the city of Dholavira. Also, a terracotta replica of the plough has been discovered from Banawali.