0 Information 195,291 âšī¸ | 1 Philosophy and Psychology 181,886 đ | 2 Religion 459,268 đđŊ | 3 Social Sciences 1,012,288 đĢ | 4 Language 129,832 đŦ | 5 Mathematics and Science 321,836 đŦ | 6 Technology 748,891 đĄ | 7 Arts and Recreation 692,253 đ¨ | 8 Literature 923,945 đ | 9 Biography and History 588,112 đŋ |

50 General Science 24,812 đŦ | 51 Mathematics 61,768 â | 52 Astronomy 17,348 đ | 53 Physics 34,083 đ | 54 Chemistry 21,970 â | 55 Earth sciences & geology 28,081 đ | 56 Fossils & prehistoric life 6,367 đ | 57 Life Sciences 45,860 đ | 58 Botany 17,589 đŋ | 59 Zoology 63,958 đŧ |

510 General Mathematics 14,922 â | 511 General Principles 5,333 đ | 512 Algebra 7,882 + | 513 Arithmetic 4,621 đĸ | 514 Trigonometry; topology 1,544 đŠ | 515 Analysis 9,652 ÎŖ | 516 Algebraic geometry 4,705 V | 517 Calculus 896 âĢ | 518 Numerical analysis 639 đģ | 519 Applied Mathematics, Probabilities 11,574 đ |

513.0 Geometry 130 | 513.1 Plane geometry 235 | 513.2 Arithmetic 2,581 | 513.3 Volumetric or solid geometry 17 | 513.4 With curved surfaces 2 | 513.5 Numeration Systems 173 | 513.6 3 | 513.7 13 | 513.8 Absolute or non-Euclidian geometry 124 | 513.9 Problems 110 |

513.50 8 | 513.51 Points; Lines; Planes; Duality | 513.52 Binary 3 | 513.53 Cones; Conics; Involutions | 513.54 -- 1 | 513.55 Decimal 46 | 513.56 Harmonic and anharmonic properties | 513.57 Correspondence; Correlation of figures | 513.58 Quadric surfaces: spheroconics, curves of double curvature | 513.59 Surfaces of higher order: cubics |