What is the best book about US Presidents out there?

I've read 'John Adams' by David McCullough and I'm just starting 'Truman' by the same author. Clearly, I'm very intrigued and interested in the Presidents of the United States. Any book suggestions about the office in particular or the US Presidents in their entirety would be appreciated! show more I've read 'John Adams' by David McCullough and I'm just starting 'Truman' by the same author. Clearly, I'm very intrigued and interested in the Presidents of the United States. Any book suggestions about the office in particular or the US Presidents in their entirety would be appreciated!
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