There is a great hugely thick book out on Lulu.com which translates into English ALL the different Tai Ji Classics books.
It's great to have it all in one place. The Taijiquan Classics by Yun Zhang, Hardcover, 782 Pages
http://www.lulu.com/shop/yun-zhang/the-taijiquan-classics/hardcover/product-22654230.html
Its pricey but at over 700 pages, it is worth it. Incredible book, huge labor went into it.
Also there is a book on Qigong for Meditation that Robert F Smith and I translated into English from Zhan Dun Xi's original book. Zhan was a student of Zhang Ce, who was a Yang TJQ and Tong Bei Quan great master.
We redid all the photos, and the text clearly explains how to do it each movement.
The first Qigong Zhan says he learned from Zhang Ce, and it is from the Yang family.
The second Qigong is a Taoist version of the 12 movement Yi Jin Jing, it is entirely different from any Shaolin based Yi Ji Jing.
The third section is health exercises from Tong Bei and TJQ.
Very rare material translated from a very rare Chinese book.
https://www.amazon.com/Taoist-Shen-Gong-Qigong-Meditation/dp/B085HNFX72/