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| 1 | Civil, M., The Farmer's Instructions. A Sumerian Agricultural Manual, Aula Orientalis - Supplementa 5, Sabadell 1994 |
| 2 | Pottorf, A.R., Social Stratification in Southern Mesopotamia during the Third Dynasty of Ur (ca. 2100–2000 BCE), Ph.D. Diss., Harvard University 2022 |
| http://cdli.earth/P109461 |
| http://oracc.museum.upenn.edu/epsd2/P109461 |
| http://isac-idb.uchicago.edu/results.php?qb%5Boperator%5D%5Bc3%5D=&qb%5Bdataset%5D%5Bc3%5D=MC&qb%5Bfield%5D%5Bc3%5D=SrchRegisNumber&qb%5Bterm%5D%5Bc3%5D=A2542 |