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Melvil Decimal System: 621.39

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Electric engineering > Computers

Dewmoji: ๐Ÿ’ก > ๐Ÿ”ฉ > ๐Ÿญ > ? > ?

0
Information
195,777
โ„น๏ธ
1
Philosophy and Psychology
182,289
๐Ÿ’ญ
2
Religion
460,996
๐Ÿ™๐Ÿฝ
3
Social Sciences
1,014,352
๐Ÿ‘ซ
4
Language
130,009
๐Ÿ’ฌ
5
Mathematics and Science
322,290
๐Ÿ”ฌ
6
Technology
750,603
๐Ÿ’ก
7
Arts and Recreation
693,508
๐ŸŽจ
8
Literature
926,050
๐Ÿ“š
9
Biography and History
589,816
๐Ÿ—ฟ
60
General Technology
6,964
๐Ÿ’ก
61
Medicine
251,541
๐Ÿ’‰
62
Engineering
127,966
๐Ÿ”ฉ
63
Agriculture & Animal Husbandry
67,905
๐ŸŒฑ
64
Home Economics
129,787
๐Ÿ 
65
Business
119,741
๐Ÿ‘”
66
Chemical Technology
15,639
๐Ÿš€
67
Manufacturing
6,347
๐Ÿ“ฆ
68
Handicraft and Occupations
15,467
๐Ÿ”จ
69
Building
9,246
๐Ÿ‘ท
620
Engineering
18,945
๐Ÿ”ฉ
621
Mechanical Engineering and Machinery
40,517
๐Ÿญ
622
Mining Engineering and Mines and Mineral Resources
2,830
๐Ÿ•ณ
623
Military Engineering and Marine Engineering
11,874
โš“
624
Civil Engineering
7,073
๐ŸŒ‰
625
Road and Railroad
3,860
๐Ÿ›ค
626
--
35
๐Ÿคท
627
Hydraulic Engineering
1,374
๐ŸŒŠ
628
Sanitary; Municipal
6,162
๐Ÿšฝ
629
Other Branches
35,296
๐ŸŒฟ
621.0
1,009
621.1
Steam engineering
504
621.2
Hydraulic machinery
203
621.3
Electric engineering
28,297
621.4
Heat engineering
3,311
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
2,177
621.9
Machine-tools
1,071
621.30
420
621.31
4,005
621.32
296
621.33
30
621.34
104
621.35
27
621.36
2,575
621.37
108
621.38
Electronics, Communications.
17,166
621.39
Computers
2,160
621.390
55
621.391
362
621.392
119
621.393
4
621.394
1
621.395
523
621.396
10
621.397
138
621.398
143
621.399
43

Works under MDS 621.39

2,160 results. First 2,000 shown.

1–50 of 1,859 ( 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
005.1Information > Computing And Information > Computer Software > Programming28.3113
005Information > Computing And Information > Computer Software24.6345
004Information > Computing And Information > Computer Hardware24.4195
00XInformation > Computing And Information19.2594
0XXInformation11604

Related tags

apple (89) autobiography (50) biography (178) business (30) circuits (26) computer (232) computer architecture (28) computer hardware (31) computer repair (28) computer science (226) computers (421) computing (137) design (43) digital design (35) ebook (76) EE (82) electrical engineering (80) electronics (220) engineering (111) hardware (216) history (34) how-to (25) mac (25) math (24) network (25) non-fiction (364) O (62) PC (43) programming (47) read (32) reference (112) science (42) Steve Jobs (28) technical (43) technology (142) textbook (76) to-read (84) uncategorized (38) unread (25) VHDL (37)

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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