Conservators Restore Rare Books Damaged In Yale Blast: Water From Sprinklers Damages About 300 Books. “About 300 rare books — the major casualties of Wednesday’s bomb explosion at Yale Law School — are being treated by expert conservators. Librarians catalogued and bagged the books, then moved them into a blast freezer at Yale’s Beinecke Rare Book and Manuscript Library. The books will wait in the freezer while librarians and conservators study how best to restore them.”