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In page North by Northwest:

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In 1995, North by Northwest was selected for preservation in the National Film Registry by the United States Library of Congress as being "culturally, historically, or aesthetically significant." In June 2008, the American Film Institute revealed its "10 Top 10" — the best ten films in ten "classic" American film genres — after polling over 1,500 people from the creative community. North by Northwest was acknowledged as the seventh-best film in the mystery genre.[4] It was also listed as No. 40 in AFI's 100 Years...100 Movies, No. 4 in AFI's 100 Years...100 Thrills, and No. 55 in AFI's 100 Years...100 Movies (10th Anniversary Edition).