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Melvil Decimal System: 621.30

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Electric engineering > Not set

Dewmoji: πŸ’‘ > πŸ”© > 🏭 > ? > ?

0
Information
174,304
ℹ️
1
Philosophy and Psychology
161,748
πŸ’­
2
Religion
423,003
πŸ™πŸ½
3
Social Sciences
881,215
πŸ‘«
4
Language
117,983
πŸ’¬
5
Mathematics and Science
273,951
πŸ”¬
6
Technology
639,220
πŸ’‘
7
Arts and Recreation
651,263
🎨
8
Literature
864,955
πŸ“š
9
Biography and History
550,626
πŸ—Ώ
60
General Technology
6,247
πŸ’‘
61
Medicine
207,679
πŸ’‰
62
Engineering
102,529
πŸ”©
63
Agriculture & Animal Husbandry
61,837
🌱
64
Home Economics
122,969
🏠
65
Business
99,248
πŸ‘”
66
Chemical Technology
11,497
πŸš€
67
Manufacturing
4,874
πŸ“¦
68
Handicraft and Occupations
14,120
πŸ”¨
69
Building
8,220
πŸ‘·
620
Engineering
12,098
πŸ”©
621
Mechanical Engineering and Machinery
31,197
🏭
622
Mining Engineering and Mines and Mineral Resources
2,343
πŸ•³
623
Military Engineering and Marine Engineering
10,854
βš“
624
Civil Engineering
5,407
πŸŒ‰
625
Road and Railroad
3,417
πŸ›€
626
--
29
🀷
627
Hydraulic Engineering
1,059
🌊
628
Sanitary; Municipal
4,548
🚽
629
Other Branches
31,577
🌿
621.0
536
621.1
Steam engineering
377
621.2
Hydraulic machinery
172
621.3
Electric engineering
21,829
621.4
Heat engineering
2,248
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
274
621.6
Fans (Machinery) and Pumping machinery
99
621.7
Production engineering and Factories and Machine-shop practice
82
621.8
Other mechanical engineering topics
1,780
621.9
Machine-tools
873
621.30
366
621.31
2,857
621.32
266
621.33
22
621.34
77
621.35
23
621.36
1,810
621.37
81
621.38
Electronics, Communications.
13,619
621.39
Computers
1,749
621.300
7
621.301
39
621.302
55
621.303
13
621.304621.305
2
621.306
8
621.307
56
621.308
3
621.309
Biography; History By Place
179

Works under MDS 621.30

1–50 of 337 ( next )titles | covers | shelf
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Wording

1922 Edition
Modern language
Emoji

"Far Friends"

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

MDSScheduleRatioCount
973Biography and History > North America > United States12.7140
97XBiography and History > North America6.1182
5XXMathematics and Science3.3199
9XXBiography and History2.2270

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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