Pickett_2017_16cut masonry blocksprocurementstonetextMiddle AgesNear Eastprocessing ashlar in minimum low skill rate0,055 m2 ashlar shaped in 1 p-hp-hvar2 / 0,055m2var1 * 0,055Data was converted from work days to person-hours. Author refers to 8 hour work days.Author distinguised two skill rates, minimum and maximum low skill rate. He operates with addiontional +10% of labour as a high-skilled rate or labour under supervision.BuccellatiF.MarkoJ.24.4.2019