Category:Explorer 21

**Explorer 21**
	American satellite of Explorers program
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	Wikipedia
Instance of	spacecraft;
Start point	Cape Canaveral Space Launch Complex 17;
Space launch vehicle	Delta C;
UTC date of spacecraft launch	4 October 1964;
Significant event	rocket launch (1964, Cape Canaveral Space Launch Complex 17);
Authority file
	Q3736074;
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Media in category "Explorer 21"

The following 2 files are in this category, out of 2 total.