his diaries
...that Ronald Reagan is the only American President to have his diaries published into a best selling book?
...that <a href="./Ronald_Reagan" id="mwDHs" rel="mw:WikiLink" title="Ronald Reagan">Ronald Reagan</a> is the only <a href="./President_of_the_United_States" id="mwDHw" rel="mw:WikiLink" title="President of the United States">American President</a> to have <b id="mwDH0"><a href="./The_Reagan_Diaries" id="mwDH4" rel="mw:WikiLink" title="The Reagan Diaries">his diaries</a></b> published into a <a href="./Bestseller" id="mwDH8" rel="mw:WikiLink" title="Bestseller">best selling book</a>?