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Subclass QA
| QA1-939 | Mathematics | |||
| QA1-43 | General | |||
| QA47-59 | Tables | |||
| QA71-90 | Instruments and machines | |||
| QA75-76.95 | Calculating machines | |||
| QA75.5-76.95 | Electronic computers. Computer science | |||
| QA76.75-76.765 | Computer software | |||
| QA101-(145) | Elementary mathematics. Arithmetic | |||
| QA150-272.5 | Algebra | |||
| QA273-280 | Probabilities. Mathematical statistics | |||
| QA299.6-433 | Analysis | |||
| QA440-699 | Geometry. Trigonometry. Topology | |||
| QA801-939 | Analytic mechanics | |||
