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Melvil Decimal System: 549.94

Wording: Mathematics and Science > Chemistry > Mineralogy > Geographic distribution > Not set

Dewmoji: πŸ”¬ > βš— > βš’ > 🌐 > ?

0
Information
196,273
ℹ️
1
Philosophy and Psychology
182,817
πŸ’­
2
Religion
463,619
πŸ™πŸ½
3
Social Sciences
1,017,722
πŸ‘«
4
Language
130,465
πŸ’¬
5
Mathematics and Science
322,970
πŸ”¬
6
Technology
751,859
πŸ’‘
7
Arts and Recreation
695,838
🎨
8
Literature
929,792
πŸ“š
9
Biography and History
592,368
πŸ—Ώ
50
General Science
24,934
πŸ”¬
51
Mathematics
61,944
βž—
52
Astronomy
17,388
🌌
53
Physics
34,172
🍎
54
Chemistry
22,053
βš—
55
Earth sciences & geology
28,173
🌎
56
Fossils & prehistoric life
6,394
πŸ’€
57
Life Sciences
45,977
🐠
58
Botany
17,698
🌿
59
Zoology
64,237
🐼
540
Chemistry
4,849
βš—
541
Physical; Theoretical
5,133
πŸ’­
542
Chemical laboratories
328
πŸ”¬
543
Analytic
2,125
🌈
544
Qualitative Analysis [No longer used]
188
545
Quantitative Analysis [No longer used]
145
546
Inorganic
2,006
⚨
547
Organic
5,498
⌬
548
Crystallography
723
πŸ’Ž
549
Mineralogy
1,058
βš’
549.0
153
549.1
Determinative; Blowpiping
128
549.2
Native elements
11
549.3
Sulfids, tellurids, selenids, arsenids, antimonids, bismuthids
9
549.4
Compounds of chlorin, bromin, iodin, and fluorin
3
549.5
Oxygen compounds
19
549.6
Silicates
110
πŸ–
549.7
Other ternary oxygen compounds
23
549.8
Hydrocarbons
549.9
Geographic distribution
120
🌐
549.90549.91
1
549.92549.93
1
549.94
19
549.95
2
549.96
5
549.97
54
549.98
1
549.99
16
549.940549.941
3
549.942
2
549.943
1
549.944549.945
9
549.946549.947
1
549.948
1
549.949
2

Wording

1922 Edition
Modern language
Emoji

"Far Friends"

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

None

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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