This is a great way to explore the American Folklife Center’s online resources which “include material from six continents, every U.S. State and territory”.
Scrolling down to the bottom of the Story Map I found resources on The Green Book with a link to a podcast: The Green Book and African American Travel with Candacy Taylor. If you use the search box in the upper right you’ll also find several posts in our TPS Teachers Network referencing The Green Book.