| MSC 1991 | Number of Preprints | |
| 51-XX | Geometry
| 2 | browse |
| 51-00 | General reference works (handbooks, dictionaries, bibliographies, etc.)
| 2 | browse |
| 51-01 | Instructional exposition (textbooks, tutorial papers, etc.)
| 2 | browse |
| 51-02 | Research exposition (monographs, survey articles)
| 2 | browse |
| 51-03 | Historical
| 2 | browse |
| 51-04 | Explicit machine computation and programs (not the theory of computation or programming)
| 2 | browse |
| 51-06 | Proceedings, conferences, collections, etc.
| 2 | browse |
| 51Axx | Linear incidence geometry
| 17 | browse |
| 51Bxx | Nonlinear incidence geometry
| 2 | browse |
| 51C05 | Ring geometry (Hjelmslev, Barbilian, etc.)
| - | |
| 51Dxx | Geometric closure systems
| 19 | browse |
| 51Exx | Finite geometry and special incidence structures
| 17 | browse |
| 51Fxx | Metric geometry
| 5 | browse |
| 51G05 | Ordered geometries (ordered incidence structures, etc.)
| - | |
| 51Hxx | Topological geometry
| 12 | browse |
| 51Jxx | Incidence groups
| - | |
| 51Kxx | Distance geometry
| 4 | browse |
| 51Lxx | Geometric order structures
| - | |
| 51Mxx | Real and complex geometry
| 44 | browse |
| 51Nxx | Analytic and descriptive geometry
| 17 | browse |
| 51P05 | Geometry and physics (should also be assigned at least one other classification number from Sections 70--86)
| 4 | browse |