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- Wade, Mark. "Encyclopedia Astronautica".
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- McDowell, Jonathan. "Jonathan's Space Report". Jonathan's Space Page.
- "Mission Set Database". NASA GSFC.
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- "Space Calendar". NASA JPL.
- "Southwest Space Archive".
- "Launch Forecast". Space.com.
- "Spaceflight Now".
- Pietrobon, Steven. "Steven Pietrobon's Space Archive".
- "U.S. Space Objects Registry".
- "Хроника освоения космоса ('Chronicle of space exploration')" (in Russian). Cosmoworld.ru.
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