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References
- ↑ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 24 April 2011.
- ↑ Ray, Justin. "Mission Status Center". Delta Mission Report. Spaceflight Now. Retrieved 24 April 2011.
- ↑ Ray, Justin (11 April 2011). "Information-routing satellite was deployed by Delta 4". Spaceflight Now. Retrieved 24 April 2011.
- ↑ Wakelin, Peter (7 April 2011). "SATOBS 2011 April 06-07". SeeSat-L. Retrieved 24 April 2011.
- 1 2 Ted, Molczan (9 April 2011). "NROL-27 / USA 227". SeeSat-L. Retrieved 24 April 2011.
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