Subjects: Mathematics; History; Science—HistoryMATHEMATICS / History & Philosophy; SCIENCE / History
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Subjects: Geometry, Infinitesimal; Geometry, Non-EuclideanMATHEMATICS / History & Philosophy; MATHEMATICS / Geometry / Non-Euclidean
Subjects: Astronomers--Correspondence; Geodesists--CorrespondenceMATHEMATICS / History & Philosophy; SCIENCE / Space Science / Astronomy; SCIENCE / History