cobuildの新版、サイズがずいぶん小さいようだね。
表記ミスかな？？

現行
16 x 6.1 x 23.4 cm
https://www.amazon.co.uk/Collins-COBUILD-Advanced-Learners-Dictionary/dp/0007580584

新版
12.8 x 2.1 x 19.8 cm
https://www.amazon.co.uk/Collins-COBUILD-Advanced-Learners-Dictionary/dp/0008253218