Oooh, it sounds like it might be an interesting book. But talk about "selling folk music" - the hardcover book is $75 from the publisher ($40 from Amazon), and even the Kindle edition is $30.
-Joe-

But even if you can't afford to buy the book, you can get a video look through it for free:

https://vimeo.com/245268165

Lots of the items pictured are in my library - I've spent 30 years collecting them.
-Joe-