0 Information 196,271 βΉοΈ | 1 Philosophy and Psychology 182,817 π | 2 Religion 463,618 ππ½ | 3 Social Sciences 1,017,722 π« | 4 Language 130,463 π¬ | 5 Mathematics and Science 322,970 π¬ | 6 Technology 751,858 π‘ | 7 Arts and Recreation 695,836 π¨ | 8 Literature 929,792 π | 9 Biography and History 592,368 πΏ |

50 General Science 24,934 π¬ | 51 Mathematics 61,944 β | 52 Astronomy 17,388 π | 53 Physics 34,172 π | 54 Chemistry 22,053 β | 55 Earth sciences & geology 28,173 π | 56 Fossils & prehistoric life 6,394 π | 57 Life Sciences 45,977 π | 58 Botany 17,698 πΏ | 59 Zoology 64,237 πΌ |

510 General Mathematics 15,018 β | 511 General Principles 5,344 π | 512 Algebra 7,899 + | 513 Arithmetic 4,632 π’ | 514 Trigonometry; topology 1,546 π© | 515 Analysis 9,673 Ξ£ | 516 Algebraic geometry 4,709 V | 517 Calculus 900 β« | 518 Numerical analysis 639 π» | 519 Applied Mathematics, Probabilities 11,584 π |

512.0 379 | 512.1 Systems of algebra 310 | 512.2 Numeric equations; Imaginary expressions 857 | 512.3 Algebraic equations; Maxima and minima 158 | 512.4 Series; Fractions; Binomial theorem; Taylor's theorem 460 | 512.5 Combinatory analysis 1,203 | 512.6 Proportion and progression 76 | 512.7 Involution and evolution 1,083 | 512.8 Higher algebra 563 | 512.9 Problems and tables 1,064 |

512.20 8 | 512.21 Equations, 1st to 4th degrees 13 | 512.22 Higher numeric equations 125 | 512.23 Indeterminate equations; Diophantin analysis 34 | 512.24 Imaginary expressions 83 | 512.25 15 | 512.26 2 | 512.27 14 | 512.28 1 | 512.29 |

512.220 2 | 512.221 1 | 512.222 | 512.223 | 512.224 | 512.225 1 | 512.226 | 512.227 | 512.228 | 512.229 |