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- dewey decimal classification::500 | naturwissenschaften::520 | astronomie, kartographie4
- 7. clean energy3
- astrophysics::high energy astrophysical phenomena3
- astrophysics::cosmology and extragalactic astrophysics2
- 13. climate action1
- 9. industry and infrastructure1
- astrophysical black holes1
- dewey decimal classification::500 | naturwissenschaften::530 | physik1
- general relativity and quantum cosmology1