This volume sees the publication of fifty-six early Old Babylonian letters from ca. 1880 BCE. They were found by legendary Iraqi archaeologist Taha Baqir in 1941 at the site of Tell ed-Der, ancient Sippar-Amnanum, in central Iraq. The letters are written in an early dialect of Akkadian and are part of the archives of an ancient firm. This firm consisted of a number of families engaged in local agriculture, the manufacturing of textiles, crediting, and international trade. As such it was part of the same larger trade networks as those already known from the contemporary Old Assyrian archives found in central Turkey. The firm strived to have good relations with local Amorite rulers, such as Sumu-la-El, the first king of Babylon, and they used their own trading agents to represent them in far-away cities such as Mari. For these reasons, the letters are also an important source for Babylonia’s political and socio-economic history.