The ePSD catalogue owes a huge debt to Bob Englund and the many people who assisted and succeeded him in working on the CDLI catalogue at https://cdli.ucla.edu [https://cdli.ucla.edu]. The CDLI catalogue is foundational to our efforts to understand the scope of the Sumerian corpus.
For the Ur III period, the ePSD catalogue primarily uses Manuel Molina's superb Database of Neo-Sumerian Texts (BDTNS) [http://bdtns.filol.csic.es/].
For Old Babylonian literary texts, the core of the cataloguing goes back to Miguel Civil's unpublished Index to the Corpus of Sumerian Literature. Civil supplied a text file of this catalogue to the the Pennsylvania Sumerian Dictionary project and also to the ETCSL project which developed it into the basis for the ETCSL catalogue [https://etcsl.orinst.ox.ac.uk/]. More recently, the CDLI project has integrated ETCSL's witness lists into the CDLI catalogue and that data has also been utilized in the ePSD catalogue.
The build procedure for the ePSD catalogue works with the data described above as well as with the source files for text editions maintained by ePSD and by partner projects such as DCCLT [/dcclt]. In addition, some scripted normalization of data is carried out, and custom modifications of the data are integrated into the build. As a result, ePSD is not a simple merger of the available data but provides a particular perspective on the Sumerian corpus.