Bulldog and Panther: The 1970 May Day Rally and Yale – Memorabilia Room, Sterling Memorial Library, Yale University. The exhibit is curated by Sarah Schmidt, Beinecke Rare Book and Manuscript Library, and Bill Landis, Manuscripts and Archives. It is free and open to the public Monday-Friday, 8:30 AM-4:45 PM, through May 16, 2014.
The Civil War Manuscripts Collection is well worth delving into and you will find many gems. The collection is an amalgam of correspondence, journals, photographs, printed materials, and ephemera documenting numerous aspects of the War from a predominantly Union point of view.