مكتبة وفنون/كل الحراج

What is the reason behind the German superiority

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By John Campner. I bought it from Jarir three weeks ago. The reason for selling is that I have read it and have other books. I bought it from Jarir for 60 riyals two weeks ago.
What is the reason behind the German superiority 0What is the reason behind the German superiority 1