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Collection: OAPEN
140 - Specific philosophical schools
5
720 - Architecture
5
900 - History & geography
5
363 - Other social problems & services
4
500 - Natural sciences & mathematics
4
620 - Engineering & allied operations
4
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100 - Philosophy & psychology
3
414 - Phonology & phonetics
3
540 - Chemistry & allied sciences
3
590 - Animals (Zoology)
3
700 - The arts; fine & decorative arts
3
581 - Specific topics in natural history
2
530 - Physics
1
551 - Geology, hydrology & meteorology
1
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