The Negro Motorist Green Book
en.wikipedia.org
en.wikipedia.org
I'm not sure it's a good fit for HN, since there's not much to say about it. We'll see.
You can read the full book here: https://archive.org/stream/history_green_book/87_135_1736_Gr...
And there's an article here: https://www.smithsonianmag.com/smart-news/read-these-chillin...