NASA NTRS · 19670055507
Tracking by the Smithsonian astrophysical observatory.
Abstract
Artificial satellites tracking by Smithsonian Astrophysical Observatory, discussing station locations, instrumentation, operation modes, interface and selection
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Lindquist, C. A., Whipple, F. L.. 1967-07-13. Tracking by the Smithsonian astrophysical observatory.. https://ntrs.nasa.gov/citations/19670055507
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