 If you liked
Gosick
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 ...then you might like
Lady Detective
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both are about 2 female detectives, both take place around a similar time period, the art, the content and the dialogues are very good in both mangas. Both girls love books. Both have a similar male partner (love interest) who helps them.
Main difference, Victorique (Gosick) is younger than Elizabeth (Lady Detective) and is more explosive than Elizabeth.