5 Mathematics and Natural Sciences
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5 MATHEMATICS. NATURAL SCIENCES
502/504 Environmental science. Conservation of natural resources. Threats to the environment and protection against them
51 Mathematics
52 Astronomy. Astrophysics. Space research. Geodesy
53 Physics
54 Chemistry. Crystallography. Mineralogy
55 Earth Sciences. Geological sciences
56 Palaeontology
57 Biological sciences in general
58 Botany
59 Zoology