97-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
97-01 Instructional exposition (textbooks, tutorial papers, etc.)
97-02 Research exposition (monographs, survey articles)
97-03 Historical (must also be assigned at least one classification number from Section 01)
97-04 Explicit machine computation and programs (not the theory of computation or programming)
97-06 Proceedings, conferences, collections, etc.
97Axx General
97Bxx Educational policy and educational systems
97Cxx Psychology of and research in mathematics education
97Dxx Education and instruction in mathematics
97Uxx Educational material and media. Educational technology