Columbia subject headings:
Astronomy--Connecticut--New Haven--History.
Yale University. Department of Astronomy--History.
Harvard subject headings:
Astronomical observatories--Connecticut--New Haven--History.
Astronomy--Research--Connecticut--New Haven--History.
Astronomy--Study and teaching--Connecticut--New Haven--History.
Yale University. Department of Astronomy--History.
Yale University. Observatory--History.
Princeton subject headings:
Astronomy--Connecticut--New Haven--History.
Astronomy--Study and teaching (Higher)--Connecticut--New Haven.
Yale University. Department of Astronomy--History.