In 'the list of book collection in Tadekura Library,' which was a list of his books dedicated to Shimogamo-jinja Shrine, 3,386 books (11,252 volumes), centering on keigaku and history, were listed, which shows Suo emphasized the learning.
下賀茂神社に自らの蔵書を奉納したときの目録である「蓼倉文庫蔵書目録」には経学・史学を中心に3,386部（11,252巻）が記され、菘翁が学問を重視していた姿勢が窺われる。