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Continue to ChatO'Reilly Media book: Jump Start Sinatra https://wp.jochen.hayek.name/blog-en/2013/12/10/oreilly-media-book-jump-start-sinatra/
O'Reilly Media book: Jump Start Sinatra https://wp.jochen.hayek.name/blog-en/2013/12/10/oreilly-media-book-jump-start-sinatra/