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space-track.org
Space Track, retrieved April 4, 2023, checked the database by searching for 'westford' (registration required for database access).{{citation}}: CS1 maint: postscript (link)
"Protests Continue Abroad", The New York Times, London (published October 23, 1961), p. 12, October 22, 1961, ISSN0362-4331
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