The Dalek Tapes were a comprehensive collection of tapes that documented the history of the planet Skaro. The Doctor discovered them after landing in a mouldering, ancient library on a twilight world.
The first tape told of the early mystery of the Daleks in their humanoid form. There were at least seven tapes, with the seventh telling of the Daleks' encounter with the Monstrons. At the conclusion of this tape, its narrator stated that the Daleks continued to spread their evil throughout the galaxy in the ensuing years. (COMIC: The Dalek Tapes)
When these accounts were published on Earth in the 21st century, they were attributed to reports from the Space News Agency (PROSE: Fireball Surrenders!, et al.) or to alien story-cubes. (COMIC: The Dalek Tapes)