Perhaps you should try some spelling variations:
"harvard world war studies book series." » "harvard cold war studies book series.", "harvard world war stories book series.", "harvard world early studies book series.", "harvard world war studies books series.", "harvard world war studies ebook series."
"harvard world case studies book series." » "harvard cold case studies book series.", "harvard world class studies book series.", "harvard world case studies books series.", "harvard world case studies ebook series."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("harvard world war studies book series.") OR ("harvard world case studies book series."))~.
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