Persepolis Administrative Archives
The Persepolis Administrative Archive (also Fortification Archive or Treasury Archive) are two groups of clay administrative archives — sets of records physically stored together – found in Persepolis dating to the Achaemenid Persian Empire. The discovery was made during legal excavations conducted by the archaeologists from the Oriental Institute of the University of Chicago in the 1930s.
Source: Wikipedia — Persepolis Administrative Archives (CC BY-SA 4.0)