WASHINGTON (AP) — Federal immigration officials have transferred about 400 handwritten pages from the wartime diary of a key Nazi adviser to Adolf Hitler to the U.S. Holocaust Memorial Museum.

Alfred Rosenberg’s words cover the rise of the Nazis from 1936 to 1944. The pages were likely smuggled into the U.S. after the war. After a lengthy investigation into the mystery of the missing diary, federal officials used a warrant to seize it in April but wouldn’t say who had it.