Book series introduced in the 20th century
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Book series introduced in the 1900s
Book series introduced in the 1910s
Book series introduced in the 1920s
Book series introduced in the 1930s
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Book series introduced in the 1950s
Book series introduced in the 1960s
Book series introduced in the 1970s
Book series introduced in the 1980s
Book series introduced in the 1990s