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Sproul Observatory
Swarthmore Inaugurates Eleventh President
DOUBLE STARS INFORMATION CIRCULAR No. 202 (OCTOBER 2020)
Table of Contents May AAC General Meeting No Summer AAC Meetings
Observational Astronomy at the University of Pennsylvania 1751 - 2007
ED026268.Pdf
HISTORY of the RITTENHOUSE ASTRONOMICAL SOCIETY 1888 – 1960
Swarthmore College Bulletin (March 2001)
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