Order of the Daleks (in-universe)
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As recorded in the Dalek Combat Training Manual published during the Last Great Time War, the Time Lords were aware of "an account" detailing the appearance of Stained-Glass Daleks on the planet Strellin. This was recorded as one of the "anomalies" of Dalek history, which were derived from "books, sound recordings and pictorial records". (PROSE: Dalek Combat Training Manual [+]Loading...["Dalek Combat Training Manual (reference book)"])