(HUFFINGTON POST) — Among the items U.S. soldiers seized from Adolf Hitler’s Bavarian Alps hideaway in the closing days of World War II were albums meticulously documenting an often forgotten Nazi crime – the massive pillaging of artwork and other cultural items as German troops marched through Europe.

Two of those albums – one filled with photographs of works of art, the other with snapshots of furniture – were donated Tuesday to the U.S. National Archives, which now has custody of 43 albums in a set of what historians believe could be as high as 100.

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