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Collection: Directory of Open Access Books
000 - Computer science, information & general works
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
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700 - The arts; fine & decorative arts
1
900 - History & geography
1
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