Strangely, more than one of the Oz books start or end with the people of Oz celebrating Betsy's birthday, though it has been claimed as being both in the spring (in Thompson's The Hungry Tiger of Oz) and on Halloween (in Bill Campbell and Irwin Terry's Masquerade in Oz--Campbell has acknowledged that had forgotten the spring reference in the former), although the weather in Oz is generally consistent with being in the Northern Hemisphere.
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In The Lost Princess of Oz she is said to be one year older than Dorothy Gale.
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Betsy is also the protagonist of Ruth Plumly Thompson's The Hungry Tiger of Oz, in which she helps a young prince from a Kingdom called Rash regain his throne.
Betsy Ross | Glorious Betsy | Hurricane Betsy | Betsy Lewin | Betsy von Furstenberg | Betsy Palmer | Betsy Mitchell | Betsy Drake | Betsy Cook | Betsy-Tacy | Betsy Russell | Betsy Nagelsen | Betsy Jolas | When the Red, Red Robin (Comes Bob, Bob, Bobbin' Along) | The Betsy | Heaven for Betsy | Frank Runyeon and Meg Ryan as Steve and Betsy in a ''ATWT'' promotion for their wedding. | Elizabeth "Betsy" Patterson | Bobbin lace | Bobbin | bobbin | Betsy Mitchell (editor) | Betsy Brandt | Betsy Blair |