Both books were recognized as priceless documents for the study of changes and trends in ancient systems of powerful families and religious services and were designated as important cultural property in June 1975 and as national treasures in June 1976.
ともに古代の氏族制度や祭祀制度の変遷を研究する上での貴重な文献として、昭和50年（1975年）6月に重要文化財、翌51年（1976年）6月に国宝の指定を受けた。