Chinese alchemy has a history of more than two thousand years, recorded from the 2nd century BCE to the present day. Its two main branches — Waidan (External Alchemy) and Neidan (Internal Alchemy) — share in part their doctrinal foundations but differ in the respective practices.
This PDF outlines the main stages of development of the Chinese alchemical tradition, and the analogies and differences among doctrines and practices of its main branches and lineages.
A fantastic and well cited collection of difficult to find information relating to both internal and external alchemy. The PDF is also filled with hyperlinks to even more information on the publisher's website.
this is a pretty good chronological reference list for Taoist texts, but it's very far removed from what I'm trying to do - follow the evolution from Taoist Alchemy to its webnovel version. Onwards we go...