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- 3D monitoring1
- 5511
- 71
- Acanthocephala1
- Bohemia1
- Bulgaria[remove]15
- Bulgarian Academy of Sciences1
- Bulharsko1
- Centrorhynchidae1
- Cestoda1
- Czech compatriots1
- Czech in Bulgaria1
- Danube River basin1
- Dictyterina cholodkowskii1
- Eastern Rhodopes1
- Eudontomyzon mariae1
- Geologie. Meteorologie. Klimatologie1
- Heteroptera1
- Krupnik-Kresna seismic zone1
- Lanius collurio1