Who was Lt Col C.B. Boswell?
Could you give any further details? The name doesn't spring to mind, although two of the most famous scholars/collectors of Boswelliana are C[hauncey] B[rewster] Tinker and Lt-Col. Ralph Isham.
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On his Grand Tour of Europe in 1764-1765, Boswell visited and befriended the famous philosophers Jean-Jacques Rosseau and François-Marie Arouet (Voltaire), and back in Edinburgh he was a personal friend of David Hume.