his lectures on Abraham Lincoln
... that Walt Whitman called one of his lectures on Abraham Lincoln "the culminating hour" of his life?
... that <a href="./Walt_Whitman" id="mwAd0" rel="mw:WikiLink" title="Walt Whitman">Walt Whitman</a> called one of <b id="mwAd4"><a href="./Walt_Whitman's_lectures_on_Abraham_Lincoln" id="mwAd8" rel="mw:WikiLink" title="Walt Whitman's lectures on Abraham Lincoln">his lectures on Abraham Lincoln</a></b> "the culminating hour" of his life?