Columbia subject headings:
Mathematics--History.
Reimers Ursus, Nicholas, 1551-1600.
Harvard subject headings:
Algebra.
Geodesy.
Reimers Ursus, Nicholas, 1551-1600. Arithmetica Analytica.
Reimers Ursus, Nicholas, 1551-1600. Geodaesia Ranzoviana.
Reimers Ursus, Nicholas, 1551-1600. Tractatiuncula.
Princeton subject headings:
Astronomers--Germany.
Mathematics--History.
Reimers Ursus, Nicholas, 1551-1600.