NASA NTRS · 19700021709
JPL development ephemeris no. 69
Abstract
Improved lunar and planetary ephemeris
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Holdridge, D. B., Melbourne, W. G., Mulholland, J. D., Ohandley, D. A.. 1969-12-15. JPL development ephemeris no. 69. https://ntrs.nasa.gov/citations/19700021709
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