What is the Green Book movie based on?

Related questions

1. How did Viggo Mortensen learn so many languages?
2. Is Mahershala Ali related to Muhammad Ali?
3. Who plays piano in the Green Book?
4. When did the Green Book Stop being published?
5. Why is it called the Green Book?
6. Is Viggo Mortensen Italian?
7. What is a green book hotel?
8. Did the Green Book win any Oscars?
9. How long was the green book published?
10. Why does Viggo Mortensen speak so many languages?

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22. #green