Margaret Penrose was a house pseudonym used by the Stratemeyer Syndicate as the author of three girls' book series published by Cupples & Leon.James Keeline, Margaret Penrose article
The name Margaret Penrose was used for: The Dorothy Dale series – 1908 to 1924, 13 volumesJohn Axe, All About Collecting Girl’s Series Books, pages 14 - 15, Hobby House Press, 2002 The Motor Girls series – 1910 to 1917, 10 volumes The Radio Girls series – 1922 to 1924, 4 volumes Camp Fire Girls books – renamed reprints of The Radio Girls series, 4 volumesDiane McClure Jone & Rosemary Jones, Encyclopedia of Collectible Children's Books, page 293, Collector Books, 2008
The Dorothy Dale series was ghostwritten by the following authors: Lilian Garis volumes 1 – 8, 11; W. Bert Foster volumes 9, 10, 12; and Elizabeth Duffield Ward volume 13.
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