Link to a book that was published in 1990. The document reflects the individual techniques taught to Chinese police and security personnel from the 1970s and 1980s, before China's period of modernization. The original cover had a trendy looking woman staring at a knife being pointed at her by an aggressor. I didn't look at the material for that reason -- wrongly judging the book by its cover.

The cover that is copied into the file on the Twirpx site is actually not the cover of the book, but a later document -- which is even more off the mark. However, the other 283 pages of the book are right on the money. The author was an instructor for the People's Armed Police and other security services. The photographs in the scanned document are generally clear. The individual techniques correspond Chinese government manuals from the 1970s and 1980s, making the document a good look into recent history.

The original book title is Self Defense 《自卫防身术》, by Du Zhongxun (杜仲勋). A link to a Chinese page about the book: