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UDC Consortium, PO Box 90407, 2509 LK The Hague, The Netherlands Tel.: (+31) 70 314 0509 Fax: (+31) 70 314 0667 E-mail: udc@kb.nl | ||||||||||
5
Mathematics and natural sciences
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| 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 |
About UDC |
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