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| 1 | Steinkeller, P., "An Estimate of the Population of the City of Umma in Ur III Times", Y. Heffron - A. Stone - M. Worthington (eds.), At the Dawn of History: Ancient Near Eastern Studies in Honour of J. N. Postgate, Winona Lake 2017, pp. 535-566 |
| 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/P273615 |
| http://www.i3-mesop-oil.gwi.uni-muenchen.de/?p=4312 |
| http://oracc.museum.upenn.edu/epsd2/P273615 |