The Morgan Library & Museum will open its vault again this summer for an exhibition of twenty-nine exceptional items from its permanent collections, including its noted holdings of important Americana. The works will go on view Tuesday, June 5 in the museum’s historic 1906 McKim building, and range from Noah Webster’s Dictionary manuscript, to revealing letters by Ernest Hemingway and James Madison, to music manuscripts by Mozart, Debussy, Schubert, and Haydn. The display will remain on view through September 8.