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Yangang küçəsi №5, Haizhu rayonu, Guangzhou şəhəri, Guangdong əyaləti, Çin
How to choose your books size?
There are different size systems in use:1)US the U.S size 2)European And Australian Popular Size 3)Chinese Size
1 inches=2.54 mm
This is Popular size:
1)USA and Canada popular size
2)European And Australian Popular Size
3)Chinese Popular Size