This Dutch book [1] by Gummbah has the text "Kooptip" imprinted on the cover, which would roughly translate to "Buying recommendation". It worked for me! [1]

This Dutch book [1] by Gummbah has the text "Kooptip" imprinted on the cover, which would roughly translate to "Buying recommendation". It worked for me! [1] https://www.amazon.com/Het-geheim-verdwenen-mysterie-Dutch/dp/9080348163 https://www.amazon.com/Het-geheim-verdwenen-mysterie-Dutch/d...