sentences:  But before Persepolis archives could have offered any clues to the better understanding of the Achaemenid history, the clay tablets, mostly written in a late dialect of Elamite, an extremely difficult language still imperfectly understood, had to be deciphered.So, in 1935, Iranian authorities loaned the Persepolis Fortification Archive to the Oriental Institute for research and publication.The archive arrived in Chicago in 1936 and has been under studies since 1937.