Melvil Decimal System: 513.210 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 nonEuclidian geometry 124  513.9 Problems 110  513.20 27  513.21 Addition, Subtraction, Multiplication and Division 1,266  513.22 Conic Sections 3  513.23 Ellipse 1  513.24 Hyperbola 33  513.25 Parabola  513.26 Fractions and Decimals 124  513.27 4  513.28 1  513.29  513.210 5  513.211 Addition and Counting 1,032  513.212 Subtraction 54  513.213 Multiplication 84  513.214 Division 35  513.215  513.216  513.217  513.218  513.219 
Wording
1922 Edition 

Modern language 

Emoji 

"Far Friends"MDS classes with significant recommendations overlap, excluding ones under the same toplevel class. 
What is MDS?Melvil stands for "Melvil Decimal System," named after Melvil Dewey, the famous librarian. Melvil Dewey invented his Dewey Decimal System in 1876, and early versions of his system are in the public domain. More recent editions of his system are in copyright, and the name "Dewey," "Dewey Decimal," "Dewey Decimal Classification" and "DDC" are registered trademarked by OCLC, who publish periodic revisions. LibraryThing's MDS system is based on the classification work of libraries around the world, whose assignments are not copyrightable. MDS "scheduldes" (the words that describe the numbers) are useradded, and based on public domain editions of the system. The Melvil Decimal System is NOT the Dewey Decimal System of today. Wordings, which are entered by members, can only come from public domain sources. The base system is the Free Decimal System, a public domain classification created by John Mark Ockerbloom. Where useful or necessary, wording comes from the 1922 edition of the Dewey Decimal System. Language and concepts may be changed to fit modern tastes, or to better describe books cataloged. Wordings may not come from incopyright sources. 