0 Information 196,273 โน๏ธ | 1 Philosophy and Psychology 182,817 ๐ญ | 2 Religion 463,619 ๐๐ฝ | 3 Social Sciences 1,017,722 ๐ซ | 4 Language 130,465 ๐ฌ | 5 Mathematics and Science 322,970 ๐ฌ | 6 Technology 751,859 ๐ก | 7 Arts and Recreation 695,838 ๐จ | 8 Literature 929,792 ๐ | 9 Biography and History 592,368 ๐ฟ |

50 General Science 24,934 ๐ฌ | 51 Mathematics 61,944 โ | 52 Astronomy 17,388 ๐ | 53 Physics 34,172 ๐ | 54 Chemistry 22,053 โ | 55 Earth sciences & geology 28,173 ๐ | 56 Fossils & prehistoric life 6,394 ๐ | 57 Life Sciences 45,977 ๐ | 58 Botany 17,698 ๐ฟ | 59 Zoology 64,237 ๐ผ |

510 General Mathematics 15,018 โ | 511 General Principles 5,344 ๐ | 512 Algebra 7,899 + | 513 Arithmetic 4,632 ๐ข | 514 Trigonometry; topology 1,546 ๐ฉ | 515 Analysis 9,673 ฮฃ | 516 Algebraic geometry 4,709 V | 517 Calculus 900 โซ | 518 Numerical analysis 639 ๐ป | 519 Applied Mathematics, Probabilities 11,584 ๐ |

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 |