Given the question: Information: - Nancy Drew is a fictional American character in a mystery fiction series created by publisher Edward Stratemeyer. The character first appeared in 1930. The books are ghostwritten by a number of authors and published under the collective pseudonym Carolyn Keene. Over the decades, the character evolved in response to changes in US culture and tastes. The books were extensively revised and shortened, beginning in 1959, in part to lower printing costs and to eliminate racist stereotypes, with arguable success. In the revision process, the heroine's original character was changed to be less assertive and more feminine. In the 1980s, an older and more professional Nancy emerged in a new series, "The Nancy Drew Files", that included romantic subplots for the sleuth. The original "Nancy Drew Mystery Stories" series started in 1930, and ended in 2004. Launched that same year, the "Girl Detective" series features Nancy driving a hybrid electric vehicle and using a cell phone. In 2013, the "Girl Detective" series ended, and a new current series called "Nancy Drew Diaries" was launched. Illustrations of the character evolved over time to reflect contemporary styles. The character proves continuously popular worldwide: at least 80million copies of the books have been sold, and the books have been translated into over 45 languages. Nancy Drew is featured in five films, two television shows, and a number of popular computer games; she also appears in a variety of merchandise sold around the world. - The Nancy Drew Mystery Stories was the long-running "main" "Nancy Drew" series, published between 1930 and 2003, under the pen name Carolyn Keene. - The Nancy Drew Notebooks are a series of books featuring the amateur sleuth Nancy Drew. The stories are aimed at younger readers and portray an 8-year-old Nancy and her friends in the third grade. Each book is illustrated with eight black and white drawings. The series original illustrator was Anthony Accardo, later volumes were illustrated by Jan Naimo Jones, and Paul Casale . The "notebook" in the series title refers to the "blue notebook in which [Nancy] keeps track of her mysteries and writes down what she learns". The stories end with a moral message telling the reader what Nancy has learned. The cover layout has changed and evolved throughout the series. It was initially published by the Minstrel imprint and later switched to the Aladdin imprint. The series ended with volume #69 in December 2005, and was relaunched (from volume 1) as Nancy Drew and the Clue Crew. - The Mystery At Lilac Inn is the fourth volume in the Nancy Drew Mystery Stories series . It was first published in 1931 under the pseudonym Carolyn Keene . Mildred Wirt Benson was the ghostwriter for the 1931 edition . In 1961 , Harriet Stratemeyer Adams extensively revised the novel , creating a completely different story . The original omitted the lead characters from much of the action , the titular inn was only a place where a crime was committed with minor investigatory follow - up , and a domestic help sub-plot was out - of - place in 1961 . Ethnic slurs and opinions were removed . - The Dana Girls was a series of young adult mystery novels produced by the Stratemeyer Syndicate. The title heroines, Jean and Louise Dana, are teenage sisters and amateur detectives who solve mysteries while at boarding school. The series was created in 1934 in an attempt to capitalize on the popularity of both the Nancy Drew Mystery Stories and the Hardy Boys series, but was less successful than either. The series was written by a number of ghostwriters and, despite going out-of-print twice, lasted from 1934 to 1979; the books have also been translated into a number of other languages. While subject to less critical attention than either Nancy Drew or the Hardy Boys, a number of critics have written about the series, most arguing that the Dana Girls' relative lack of success was due to the more dated nature of the series. - Carolyn Keene is the pseudonym of the authors of the Nancy Drew mystery stories and The Dana Girls mystery stories, both produced by the Stratemeyer Syndicate. In addition, the Keene pen name is credited with the Nancy Drew spin-off, "River Heights and the Nancy Drew Notebooks. What is the relationship between 'the mystery at lilac inn' and '1930'?
The answer is:
publication date