Huán dān zhì yào piān 還丹至藥篇

Treatise on the Supreme Drug of the Return-Elixir

by 王賢芝 (Wáng Xiánzhī) — Sòng Daoist alchemist

A Sòng nèi dān treatise. Preserved as DZ 1092 / CT 1092 (Tài xuán bù 太玄部).

Dating. Sòng. Dynasty: 宋.