@ Edy
The product image (Barrons) is showing 50.000 words, phrases....
The product description (Duden) ist stating over 45.000 word, phrases....
http://www.amazon.com/Pocket-Oxford-...sr=8-2-catcorr
Another (possible) difference might be the kind of english - Oxford is (or should be) very British, the Barron-Cover shows the wording "American-style"