Symbol of Enlil, Sumerian God of the Sky, Earth, & Water
Early Sumerian Tablet -- 3100-2900 BCE -- Discovered in Uruk, (Southern Mesopotamia) -- Details of a land purchase which included one male slave. No further reference provided.
Sumerian star map from Ninive 3000 B.C.
The Oldest Known Dictionary: The Harra hubullu (aka the Urra=hubullu) The oldest known dictionary is on a series of cuneiform tablets from the Akkadian Empire with bilingual word lists in Sumerian and Akkadian. It was discovered in Ebla in modern Syria and dates from the early 2nd millennium BC