Of course, the best is the Song rubbings. The existing Song rubbings "The First Collection of Li Qi" and "Xu Ming" (that is, the collection of Li Qi in the Palace Museum) are extensions of the Northern Song Dynasty; Secondly, Li Hongyi's book, also known as the Broken Square Book (that is, Mitsui's book, the Japanese Mitsui Art Memorial Collection), was continued in the Southern Song Dynasty;
The above two versions are most suitable for copying, among which Li Qiben is thicker and Mitsui Ben is thinner and harder, which is slightly different (due to extension).
In addition, Mr Tian, a calligrapher in Tianjin, once published Song Tuo of Tian Ji, but according to textual research, it is a reprint, but it is not bad, and many strokes are worthy of reference.
I hope it helps you.