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In the Victorian era (1837-1901), the invention of the rotary printing press made it easier to publish books even in that period, many [url=http://www.sudoku.org.uk/myHistory.asp?page=0&AID=68432]http://www.sudoku.org.uk/myHistory.asp?page=0&AID=68432[/url] of a lascivious nature were published, often under pseudonyms or anonymously.