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Melvil Decimal System: 621

Wording: Technology > Engineering, contracts > Mechanical Engineering and Machinery

Dewmoji: 💡 > 🔩 > 🏭

0
Information
196,271
ℹī¸
1
Philosophy and Psychology
182,817
💭
2
Religion
463,618
🙏đŸŊ
3
Social Sciences
1,017,722
đŸ‘Ģ
4
Language
130,463
đŸ’Ŧ
5
Mathematics and Science
322,970
đŸ”Ŧ
6
Technology
751,858
💡
7
Arts and Recreation
695,836
🎨
8
Literature
929,792
📚
9
Biography and History
592,368
đŸ—ŋ
60
General Technology
6,985
💡
61
Medicine
251,982
💉
62
Engineering, contracts
128,146
🔩
63
Agriculture & Animal Husbandry
68,016
🌱
64
Home Economics
130,045
🏠
65
Business
119,888
👔
66
Chemical Technology
15,663
🚀
67
Manufacturing
6,358
đŸ“Ļ
68
Handicraft and Occupations
15,511
🔨
69
Building
9,264
👷
620
Engineering
18,961
🔩
621
Mechanical Engineering and Machinery
40,539
🏭
622
Mining Engineering and Mines and Mineral Resources
2,834
đŸ•ŗ
623
Military Engineering and Marine Engineering
11,904
⚓
624
Civil Engineering
7,081
🌉
625
Road and Railroad
3,892
🛤
626
--
37
🤷
627
Hydraulic Engineering
1,379
🌊
628
Sanitary; Municipal
6,166
đŸšŊ
629
Other Branches
35,353
đŸŒŋ
621.0
1,010
621.1
Steam engineering
504
621.2
Hydraulic machinery
203
621.3
Electric engineering
28,314
621.4
Heat engineering
3,312
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
375
621.6
Fans (Machinery) and Pumping machinery
139
621.7
Production engineering and Factories and Machine-shop practice
129
621.8
Other mechanical engineering topics
2,179
621.9
Machine-tools
1,070

Works under MDS 621

40,539 results. First 2,000 shown.

1–50 of 1,949 ( next )titles | covers | shelf
( next )

Wording

1922 Edition
Modern language
Emoji

"Far Friends"

MDS classes with significant recommendations overlap, excluding ones under the same top-level class.

MDSScheduleRatioCount
005.43Information > Computing And Information > Computer Software > Compilers And Operating Systems > Unix-Like16.8134
005.13Information > Computing And Information > Computer Software > Programming > Languages14.5363
537Mathematics and Science > Physics > Electricity14.5145
005.1Information > Computing And Information > Computer Software > Programming11.6580
005.4Information > Computing And Information > Computer Software > Compilers And Operating Systems 11.3315
004.1Information > Computing And Information > Computer Hardware > By Computer Type11.1133
004.16Information > Computing And Information > Computer Hardware > By Computer Type > Personal Computers10.8119
531Mathematics and Science > Physics > Mechanics10.7118
005.44Information > Computing And Information > Computer Software > Compilers And Operating Systems 10.3144
004.6Information > Computing And Information > Computer Hardware > Networking10.2296
001.64Information > Computing And Information > Knowledge > Computer Science9.9139
001.6Information > Computing And Information > Knowledge > Computer Science9.4169
530.1Mathematics and Science > Physics > Physics > Theoretical Physics9.2202
005.8Information > Computing And Information > Computer Software > Computer Security9.1163
004Information > Computing And Information > Computer Hardware8.2844
005Information > Computing And Information > Computer Software8.11652
530Mathematics and Science > Physics > Physics8498
53XMathematics and Science > Physics7.9970
00XInformation > Computing And Information6.93150
515Mathematics and Science > Mathematics > Analysis6.7227

Related tags

Africa (232) Amateur Radio (183) American History (165) biography (2,298) computer (167) computer science (188) computers (420) construction (236) DIY (232) electrical (194) electrical engineering (286) electricity (607) electronics (2,030) energy (246) engineering (1,056) fiction (155) ham radio (167) history (1,303) home improvement (218) how-to (191) inventions (162) inventors (572) machines (230) Malawi (145) math (193) memoir (137) music (180) non-fiction (2,698) physics (520) picture book (222) radio (373) reference (562) science (2,550) technology (734) textbook (375) Thomas Edison (204) to-read (506) tools (518) transportation (212) woodworking (188)

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 user-added, 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 in-copyright sources.

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