Ebook: The Xingyi Boxing Manual: Hebei Style's Five Principles and Seven Words

China doesn't have these type of manuals anymore.
Taiwan might have a few.
The translator and publisher
did an important contribution to Chinese martial arts
manual preservation.

Difficult Chinese writing, these are truly the old old school writings.
You need a college level course in Hong Kong to understand this.
Or hopefully the yahoo hk dictionary would be enough.

So, be glad the translation is here.