First Summary (The Ten Main Classes) |
| 000 : Computers, information, & general works
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| 100 : Philosophy & psychology
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| 200 : Religion
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| 300 : Social sciences
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| 400 : Language
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| 500 : Science
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| 600 : Technology
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| 700 : Arts & recreation
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| 800 : Literature
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| 900 : History & geography |
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