0 Information 183,829 โน๏ธ | 1 Philosophy and Psychology 172,351 ๐ญ | 2 Religion 443,755 ๐๐ฝ | 3 Social Sciences 952,115 ๐ซ | 4 Language 123,707 ๐ฌ | 5 Mathematics and Science 297,296 ๐ฌ | 6 Technology 692,375 ๐ก | 7 Arts and Recreation 669,452 ๐จ | 8 Literature 891,726 ๐ | 9 Biography and History 567,666 ๐ฟ |

50 General Science 23,864 ๐ฌ | 51 Mathematics 56,683 โ | 52 Astronomy 16,316 ๐ | 53 Physics 30,054 ๐ | 54 Chemistry 19,002 โ | 55 Earth sciences & geology 26,281 ๐ | 56 Fossils & prehistoric life 6,175 ๐ | 57 Life Sciences 40,856 ๐ | 58 Botany 16,495 ๐ฟ | 59 Zoology 61,570 ๐ผ |

510 General Mathematics 14,112 โ | 511 General Principles 4,975 ๐ | 512 Algebra 7,203 + | 513 Arithmetic 4,475 ๐ข | 514 Trigonometry; topology 1,372 ๐ฉ | 515 Analysis 8,471 ฮฃ | 516 Algebraic geometry 4,307 V | 517 Calculus 840 โซ | 518 Numerical analysis 538 ๐ป | 519 Applied Mathematics, Probabilities 10,390 ๐ |

512.0 342 | 512.1 Systems of algebra 292 | 512.2 Numeric equations; Imaginary expressions 754 | 512.3 Algebraic equations; Maxima and minima 146 | 512.4 Series; Fractions; Binomial theorem; Taylor's theorem 384 | 512.5 Combinatory analysis 1,069 | 512.6 Proportion and progression 61 | 512.7 Involution and evolution 963 | 512.8 Higher algebra 541 | 512.9 Problems and tables 983 |

512.20 7 | 512.21 Equations, 1st to 4th degrees 13 | 512.22 Higher numeric equations 112 | 512.23 Indeterminate equations; Diophantin analysis 30 | 512.24 Imaginary expressions 79 | 512.25 11 | 512.26 1 | 512.27 13 | 512.28 1 | 512.29 |

512.240 | 512.241 | 512.242 | 512.243 1 | 512.244 | 512.245 | 512.246 | 512.247 | 512.248 | 512.249 |