The best ones are of course the Song rubbings. The most existing Song rubbings are the ones collected by the consort Li Qi of the Ming Dynasty (the Li Qi edition, collected by the Palace Museum), which are the Northern Song rubbings; the second is the Li Hongyi edition, also known as the Duanfang edition. (The Mitsui original, collected by the Mitsui Museum of Art, Japan), is a rubbing from the Southern Song Dynasty;

The above two versions are the most suitable for copying. Among them, the Li Qi version is thicker and the Mitsui version is thinner and harder, slightly different. (Due to the workmanship).

In addition, Tianjin Ou Kai calligrapher Mr. Tian Yunzhang once published a "Tian's Collection" Song rubbings, but according to research, it is a reprinted version, but the engraving is pretty good, and many strokes can be used as a reference.

Hope it helps.