. . . . . . . . . . . . "irn555272" . . . . . . . "Heinz and Mira Wallerstein collection"@en . . "Collection documenting Mira Wallerstein in Russia and Czechoslovakia and Heinz Wallerstein in Kassel, Germany until their separate immigration to the United States in the late 1930s and early 1940s."@en . . . . . . . . . . . . . . . . . . . . . .