Smithsonian Magazine published an article in their April, 2016, by Jacinda Townsend.
Skip through the advertisment.
www.smithsonianmag.com/smithsonian-institution/history-green-book-african-american-travelers-180958506/

Three years previous there was this article/blog
www.greenbookchronicles.com/

In 2010 Smithsonian Magazine published this article
www.smithsonianmag.com/smithsonian-institution/how-the-green-book-aided-african-american-motorists-768608/

Sincerely,
Gargoyle

Listening to a B. Obama clip on today's radio. It is astounding how much the president sounds like the American Comedian "Bill Cosby".