Daozang
The Daozang () is a large canon of Taoist writings, consisting of around 1,400 texts that were seen as continuing traditions first embodied by the Daodejing, Zhuangzi, and Liezi. The canon was assembled by monks  in an attempt to bring together these disparate yet consonant teachings, and it included commentaries and expositions from various masters on material found in the aforementioned core texts of Taoism. The anthology consisted of three divisions (known as grottoes) based on what were seen at that time in Southern China as Taoism's primary focuses: meditation, ritual, and exorcism. These three grottoes were ranked by skill level—with exorcism being the lowest and meditation the highest—and used for the initiation of Taoist masters. In addition to the Three Grottoes, there were the "Four Supplements" that were added to the canon . Three were primarily sourced from the older core texts, with the other taken from a separate, established philosophical tradition known as Tianshi Dao. Unlike many spiritual and religious canons, the Daozang is not considered to be highly organized. Although at present the core divisions have been preserved, substantial forks in the ordering and arrangement of the constituent texts have arisen due to the later addition of commentaries, revelations and texts further elaborating upon earlier iterations. Timeline 
The First Daozang
During the era of Northern and Southern dynasties, this was the first time of an effort was made to compile and categorised scriptures and texts from across China by Lu Xiujing and occurred around 471 and consisted of roughly 1,228 scrolls. The Second Daozang
In 748, the Tang emperor Tang Xuan-Zong who was a devoted Taoist (the royal family claimed to be the descendants of Laozi) sent clergy to collect more scriptures and texts that expanded the Taoist Canon. The Third Daozang
Around 1016 of the Song dynasty, the Daozang was revised and many texts collected during the Tang dynasty were removed. This third Daozang consisted of approximately more than 4500 scrolls and was known as Yunji Qiqian. The Fourth Daozang
In 1444 of the Ming dynasty, a final version was produced consisting of approximately 5300 scrolls. Many new Daozang were published. Constituent parts

Three Grottoes ()  400 
Authenticity Grotto (Dongzhen) : Texts of Supreme Purity (Shangqing) tradition
This grotto is concerned mainly with meditation and is the highest phase of initiation for a Taoist master. Mystery Grotto (Dongxuan) : Texts of Sacred Treasure (Lingbao) tradition
This grotto is concerned mainly with rituals and is the middle phase of initiation for a Taoist master. Spirit Grotto (Dongshen) : Texts of Three Sovereigns (Sanhuang) tradition
This grotto is concerned mainly with exorcisms and is the lowest phase of initiation for a Taoist master. Each of the Three Grottoes contains the following 12 chapters 
Main texts (Benwen) 
Talismans (Shenfu) 
Commentaries (Yujue) 
Diagrams and illustrations (Lingtu) 
Histories and genealogies (Pulu) 
Precepts (Jielu) 
Ceremonies (Weiyi) 
Rituals (Fangfa) 
Practices (Zhongshu) 
Biographies (Jizhuan) 
Hymns (Zansong) 
Memorials (Biaozou)

Four Supplements 500 
Great Mystery (Taixuan) : Based on the Dao De Jing
Great Peace (Taiping) : Based on the Taiping Jing
Great Purity (Taiqing) : Based on the Taiqing Jing and other alchemical texts
Orthodox One (Zhengyi) : Based on the Way of the Celestial Masters (Tianshi Dao) tradition. External links

 Daozang (Taoist Canon) and Subsidiary Compilations (Judith M. Boltz), sample entry from The Encyclopledia of Taoism
 The Taoist Canon - maintained by David K. Jordan at UCSD. See also his overview of the canons of all three major Chinese religions, Buddhism, Confucianism and Taoism, here. Daoist Studies Daozang project - maintained by James Miller at Queen's University
  Tao Store Index - Online Taoist Scriptures in English
 Daozang - maintained by Raymond Larose at Jade Purity
 Daozang Jiyao Project
 Daozang Jiyao Catalogue (PDF) - Includes references to works also found or not found in the Daozang
 
 Digital Resources of Traditional Chinese Taoism (Daoism) Culture for Free Download
 

Series of books
5th-century Taoism