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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For most of his adult life Boswell was better known for his "Account of Corsica", which lead to the sobriquet Corsica Boswell, than for his friendship with Dr. Johnson.