Books by Charles Harris Allen:
Books in the extended shelves:
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Allen, Charles Harris, F.R.G.S.: Tripoli, Tunis, Algeria and Morocco. Report to the committee of the British and Foreign Anti-Slavery Society. (British and Foreign Anti-Slavery Society, 1892), also by Henry Gurney and British and Foreign Anti-slavery Society (page images at HathiTrust)
Find more by Charles Harris Allen at your library, or elsewhere.