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- X-ray astronomy 26
- X-ray binaries 82
- X-ray crystallography 23
- X-ray scattering 4
- X-ray spectroscopy 31
- X-rays 86
- X-rays diffraction 66
- Xafarderia 1
- Xammar, Eugeni, 1888-1973 1
- Xampany 1
- Xampú 1
- Xanten (Alemanya) 1
- Xanthomatosis 2
- Xantomatosi 2
- Xaperones moleculars 11
- Xarampió 7
- Xarq al-Àndalus 1
- Xarxa complexa 1
- Xarxa de Bravais 1
- Xarxa lògica programable 1