UDC: 50 Generalities about the pure sciences

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Common auxiliaries

## 5 Mathematics and natural sciences
50 Generalities about the pure sciences

501 | Generalities about the pure sciences. Mathematical sciences in the broad sense
502/504 | Environmental science. Conservation of natural resources. Threats to the environment and protection against them
502 | The environment and its protection
502.3/.7 | Parts of the environment
504 | Threats to the environment. Including: Pollution

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