https://pfaffs.web.lehigh.edu/node/60154
Last Words on the Diamond Lens Controversy | The Vault at Pfaff's
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https://www.21voa.com/special_english/the-diamond-lens-part-two-fitz-james-o-brien-71473.html
VOA Special English - 'The Diamond Lens' by Fitz-James O'Brien, Part Two
VOA Special English, American Stories, 'The Diamond Lens' by Fitz-James O'Brien, Part Two
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