Columbia subject headings:
Harvard subject headings:
Calendar reform--Early works to 1800.
Calendar--Germany--History.
Hamberger, Georg Albrecht, 1662-1716--Correspondence.
Physicists--Germany--Correspondence.
Princeton subject headings:
Calendar reform--Early works to 1800.
Calendars--Germany--History.
Hamberger, Georg Albrecht, 1662-1716--Correspondence.