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This book is basically the notes, essays, letters etc etc that James Baldwin had planned to pull together for his book 'Remember this House' which remained unfinished at the time of his death.
These notes where then pulled together by Raoul Peck and resulted in the I Am Not Your Negro documentary.
It's a very quick read, for me I would prefer to watch the documentary, and I will do, however it did slightly build upon the Martin Luther King / Malcom X book that I read last year so it was worthwhile.