Picture 1. The earliest known manuscript, found at Guodian. Bamboo slips, ca. 300 BCE or slightly earlier.
Picture 2. Manuscript found at Mawangdui. Silk, ca. 200 BCE.
Picture 3. "Xiang'er" commentary, 2nd century CE. Dunhuang manuscript, 8th century CE. [See a larger picture]
Picture 4. A commentary in the Daozang (Taoist Canon). Fascicle from the original printing, 1445 CE.