索引号
A - General Works
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B - Philosophy, Psychology, Religion
4,816
C - Historical Sciences
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D - World History
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E - United States History
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F - General American History
2
G - Geography, Anthropology, Recreation
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H - Social Science
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K - Law
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L - Education
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M - Music
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N - Fine Arts
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P - Language and Literature
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R - Medicine
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S - Agriculture
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U - Military Science
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