It is said that there were many copies of administrative documents, such as shocho (account books or registers managed by central administrative offices) concerning Mutsu and Dewa Provinces and tabumi (registers of areas or ownerships of rice fields), left in Hiraizumi at the end of the Oshu Fujiwara clan.
奥州藤原氏滅亡時、平泉には陸奥、出羽の省帳、田文などの行政文書の写しが多数あったという。