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New York Times Awesome Hard Crossword Puzzles: The New York Times: 9781250851512: Amazon.com: Books
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Ii. the World's Hardest Crossword Puzzle | Esquire | February 1965
Telegraph reader cracks two-year challenge of 'world's hardest crossword' in two hours
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'World's hardest ever crossword' that takes two years to complete revealed - can YOU solve it? - Mirror Online
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World's hardest ever crossword' that takes two years to complete revealed - can YOU solve it? - Mirror Online
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