| http://www.w3.org/ns/prov#value | - A specialist in U.S. immigration and ethnic history and in the history of American medicine, he is the author or editor of eight books, including The Huddled Masses: The Immigrant in American Society, 1880-1921 (1982; rev. 2001), American Refugee Policy and European Jewry, 1933-1945 (co-authored, 1987), and Silent Travelers: Germs, Genes, and the ???Immigrant Menace??? (1994).
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