Some of the books in this series are great sources of info. In this case, the book tries to write a little about every kind of production-related structure and it is amazing how many types there are. But as a result a very brief description is given, then a few sources for further reading, sometimes websites and sometimes books, which actually look like good recommendations, and key sites where you can see the objects in person. Because it is spread over so much, most of the specific info is lacking. One is apparently expected to go outside the book for full info.