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- X-ray 1
- X-ray absorptiometry 1
- Xamanismo 1
- Xantana 8
- Xanthan 6
- Xanthan gum 5
- Xanthomonas arboricola pv pruni 2
- Xanthomonas arborícola pv pruni 1
- Xanthomonas axonopodis pv. phaseoli 1
- Xavante 1
- Xilema 2
- Xilogravura 1
- Xilófagos 1
- Xisto agrícola 1
- XIX Century 1
- Xixarro 1
- XOR gates 1
- XX Century 1
- Xylem 1
- Xylem hydraulic conductance 1