api: filter books by preview
authorJan Szejko <janek37@gmail.com>
Tue, 5 Jun 2018 08:29:06 +0000 (10:29 +0200)
committerJan Szejko <janek37@gmail.com>
Tue, 5 Jun 2018 08:29:06 +0000 (10:29 +0200)

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