Abba (from L to R) Bjorn Ulvaeus, Agnetha Faltskog, Anni-frid Lyngstad & Benny Andersson pose on February 9, 1974

Abba (from L to R) Bjorn Ulvaeus, Agnetha Faltskog, Anni-frid Lyngstad & Benny Andersson pose on February 9, 1974

Swedish pop group Abba (from L to R) Bjorn Ulvaeus, Agnetha Faltskog, Anni-frid Lyngstad and Benny Andersson, pose on February 9, 1974. Two rare ABBA recordings along with clogs and clippings will go under the hammer in Stockholm in August when a vast collection of memorabilia of the legendary group goes on sale, an auction house said Friday.

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