Which types of texts survive from the Old or Classical Sumerian period?

During the Old, or Classical, period of Sumerian (c. 2500–2300 BCE), the surviving texts consist of a variety of records, primarily associated with the early rulers of Lagash. These include:1

• Business, legal, and administrative texts: These documents provide significant insight into the societal and economic functions of the era.1
• Inscriptions: These consist of both royal and private inscriptions, which were mostly of a votive character.1
• Correspondence: Both private and official letters have been preserved from this period.1
• Incantations: These religious or ritualistic texts also form part of the surviving corpus.1

These sources are notably more numerous than those from the preceding Archaic period, providing sufficient detail to allow for an adequate reconstruction of Sumerian grammar and vocabulary.1