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Classification: 333 - Economics of land & energy
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Classification: 363 - Other social problems & services
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333 - Economics of land & energy
363 - Other social problems & services
320 - Political science
5
551 - Geology, hydrology & meteorology
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330 - Economics
3
581 - Specific topics in natural history
3
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600 - Technology
3
620 - Engineering & allied operations
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
340 - Law
1
700 - The arts; fine & decorative arts
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