Pickett_2016_106 PickettJ. 2016 106 RadfordW.A. 1913 129 earth digging procurement earth modern Eurasia 1 p-h to shovel loam in m3 0,76 m3 of loam in 1 p-h p-h var2 / 0,76 m3 var1 * 0,76 Data was converted from work days to person-hours. Author refers to 10 hour work days. BuccellatiF. MarkoJ.27.4.2019