- X-axis Perpendicular to Orbital Plane
- NASA: XPOP
Универсальный русско-английский словарь. Академик.ру. 2011.
X-axis Perpendicular to Orbital Plane
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XPOP — X axis Perpendicular to Orbital Plane (Governmental » NASA) … Abbreviations dictionary
XPOP — abbr. X Axis Perpendicular to Orbital Plane … Dictionary of abbreviations
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