In the "Ryonoshuge" (a book of annotation for Yoro-ritsuryo, which was written by KOREMUNE no Naomoto), it's recorded that there were 50 kamiko (hereditary artisans for paper making under government management) in the Yamashiro Province (present day Kyoto Prefecture).
『令集解』には、紙戸五○戸を山代国（山城国・現京都）に置いたと記録している。