In the late Edo Period, Tadatomo HOIDA (a scholar of Japanese classical literature taught by Atsutane HIRATA) took notice of the historical materials which were written on the back side of monjo from the Sutra copying office; some monjo were picked out in order to restore those kosei and shozeicho to their original states, and these were then compiled into 45 volumes (master document) from 1833 to 1836.
江戸時代後期、穂井田忠友（平田篤胤に学んだ国学者）によって写経所文書の紙背にある史料が注目され、1833年-1836年（天保4-7年）、元の戸籍・正税帳などの状態を復元すべく一部の文書が抜出されて、45巻（正集）にまとめられた。