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Collection: Directory of Open Access Books
600 - Technology
4
620 - Engineering & allied operations
2
900 - History & geography
2
300 - Social sciences
1
320 - Political science
1
333 - Economics of land & energy
1
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363 - Other social problems & services
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
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