0600  General reference works (handbooks, dictionaries, bibliographies, etc.)


0601  Instructional exposition (textbooks, tutorial papers, etc.)


0602  Research exposition (monographs, survey articles)


0603  Historical (must also be assigned at least one classification number from Section 01)


0604  Explicit machine computation and programs (not the theory of computation or programming)


0606  Proceedings, conferences, collections, etc.



06Axx  Ordered sets

06Bxx  Lattices [See also 03G10]

06Cxx  Modular lattices, complemented lattices

06Dxx  Distributive lattices

06Exx  Boolean algebras (Boolean rings) [See also 03G05]

06Fxx  Ordered structures
