I like Ma Hong books on notes from Chen Fa Ke-> Chen Zhao Kui-> Ma Hong.
I like Wang Xi An books on requirements and apps of Chen Tai Chi Lao Jia.
I also like Wang Pei Sheng books and Wu Tai Chi (northern/beijing as opposed to southern/shanghai).
http://i22.photobucket.com/albums/b343/SPJ/chentc.jpg
http://i22.photobucket.com/albums/b343/SPJ/wutc.jpg