Nulis terusan kanggo paragraf iki - The 2015 Catalunya GP2 and GP3 Series round was a pair of motor races held on May 9 and 10, 2015 at the Circuit de Catalunya in Spain as part of the GP2 and GP3 Series. Iku babak kapindho saka 2015 GP2 Series mangsa lan babak kapisan saka 2015 GP3 Series mangsa. Akhir minggu balapan ndhukung Grand Prix Spanyol 2015
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