Umkehr
| inversion technique
| umkehr | |
| phys. | Inversion |
| inversion technique | |
| environ. chem. | Umkehrmethode |
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| Inversion f | |||
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Umkehr : 14 phrases in 3 subjects |
| Environment | 3 |
| Life sciences | 8 |
| Optics branch of physics | 3 |