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The Tenth Doctor shown Donna a copy of Death in the Clouds with a copyright page identifying it as a facsimile edition published in the year 5,000,000,000. (TV: The Unicorn and the Wasp)

When reading an unwanted book about golf, Panda used blu-tack to turn the pages. (PROSE: Iris Wildthyme and the Unholy Ghost)

Information from invalid sources
The editor of Target Books once told two of his writers to write 128 pages and then simply stop. (NOTVALID: The Complete Guide to Doctor Who?)