Columbia subject headings:
Harvard subject headings:
Calculators--Germany--History--17th century.
Gottfried Wilhelm Leibniz Bibliothek--Niedersächsische Landesbibliothek.
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716
Mathematical instruments--Germany--History--17th century.
Mathematicians--Germany--Biography
Mathematics--Germany--History--17th century.
Philosophers--Germany--Biography
Princeton subject headings:
Calculators--Germany--History--17th century.
Gottfried Wilhelm Leibniz Bibliothek--Niedersächsische Landesbibliothek.
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716.
Mathematical instruments--Germany--History--17th century.
Mathematicians--Germany--Biography.
Mathematics--Germany--History--17th century.
Philosophers--Germany--Biography.