{For papers involving machine computations and programs in a specific mathematical area, see Section -04 in that area}
68-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
68-01 Instructional exposition (textbooks, tutorial papers, etc.)
68-02 Research exposition (monographs, survey articles)
68-03 Historical (must also be assigned at least one classification number from Section 01)
68-04 Explicit machine computation and programs (not the theory of computation or programming)
68-06 Proceedings, conferences, collections, etc.
68Mxx Computer system organization
68Nxx Software
68Pxx Theory of data
68Qxx Theory of computing
68Rxx Discrete mathematics in relation to computer science
68Txx Artificial intelligence
68Uxx Computing methodologies and applications
68Wxx Algorithms {For numerical algorithms, see 65-XX; for combinatorics and graph theory, see 68Rxx}