| 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. |
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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} |