I am not sure how to put this into the form of a question or it needs to be. What I want to do is make folks aware of Jon Petersons Playing at the World a book about the history of roleplaying games and wargaming.
What sets this book off from previous efforts at roleplaying history is that Peterson has documented nearly every section of the book. This is possible due to the rise of the roleplaying collector market in the past decade and Peterson has or gained access to a huge variety of documents spanning the dawn of wargames to the mid 70s the cut off time of the book. The book is extensively footnoted point out the sources of specific paragraphs.
People should keep this source in mind when answering History of Gaming questions like the one on the origin of experience points.
Addition: I was a little confused at Mxyzplk answer and looking over my question I think why.
I am NOT proposing to post anything on the main rpg.stackexchange.com site. I was just wondering how to post the info here on meta as I think mentioning Playing at the World is a meta issue not something for the main site. I do appreciate the info on the community ads.