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3Published [c. 1977]“…Library of Congress photoduplication service,…”
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4“…The Library of Congress, Congressional Research Service…”
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5Published 1926.“…Reference service on international affairs of the American Library in Paris,…”
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6“…Washington, D.C. : The Library of Congress, Congressional Research Service, 1978…”
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7Published 1974.“…Dalhousie University, University Libraries-School of Library Service,…”
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