“…collection of scriptures that came to be termed Daozang 道藏 (Daoist canon) grew over the centuries. Since the Tang, the imperial court sponsored its publication on at least five occasions. None have survived. A new version was compiled between 1406 and 1445 and was the first to be printed (in 1447). It is often referred to as the Zhengtong Daozang 正統道藏 (Daoist canon of the Zhengtong era)…..Much of what the Daozang contains cannot be found elsewhere and it is therefore an important source for historians and not only of Daoism.”
“There are a number of modern reprints: Daozang, 1120 ce, Shanghai: Shangwu, 1923-26 (sometimes called the Hanfenlou 涵芬樓 edition); facs. Rpnt. Yiwen, 1962. Rpnt Xinwenfeng, 60 ce., 1977 (this edition)….N.B. The Index of Zhonghua Daozang volume contains author/title indexes. The Index of Zhonghua Daozang (Fabrizio Pregadio, comp., Golden Elixer, 2009) enables location of Zhengtong Daozang texts in the Zhonghua Daozang and vice-versa.” - - Cf. E. Wilkinson, Chinese history, a new manual: 4th ed. (2015), p. 382