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Freedman, Robert O, 340.9194-F853i | Westview Press | 1995 340.9194-F853i,
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Freedman, Robert O, 331.2-F853s | Duke University Press | 1984 331.2-F853s,
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Engel, Dean, 651-E57e | Silver Moon press | 1994 651-E57e,