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Melvil Decimal System: 509.04

Wording: Mathematics and Science > General Science > Biography And History > By Period > 20th Century

Dewmoji: πŸ”¬ > πŸ”¬ > βŒ› > T > ?

0
Information
183,829
ℹ️
1
Philosophy and Psychology
172,351
πŸ’­
2
Religion
443,755
πŸ™πŸ½
3
Social Sciences
952,115
πŸ‘«
4
Language
123,707
πŸ’¬
5
Mathematics and Science
297,296
πŸ”¬
6
Technology
692,375
πŸ’‘
7
Arts and Recreation
669,452
🎨
8
Literature
891,726
πŸ“š
9
Biography and History
567,666
πŸ—Ώ
50
General Science
23,864
πŸ”¬
51
Mathematics
56,683
βž—
52
Astronomy
16,316
🌌
53
Physics
30,054
🍎
54
Chemistry
19,002
βš—
55
Earth sciences & geology
26,281
🌎
56
Fossils & prehistoric life
6,175
πŸ’€
57
Life Sciences
40,856
🐠
58
Botany
16,495
🌿
59
Zoology
61,570
🐼
500
General Science
7,255
πŸ”¬
501
Theory And Instruction
2,641
502
Miscellany
1,098
πŸ‘
503
Dictionaries And Encyclopedias
600
πŸ“•
504
[No longer in use]
128
🀷
505
Periodicals
178
T
506
Societies
280
507
Education And Research
3,316
508
Natural history
5,201
509
Biography And History
3,167
βŒ›
509.0
By Period
224
T
509.1
Other Geographic Classifications
43
509.2
Biography
825
509.3
Ancient World
83
509.4
Europe
302
509.5
Asia
97
509.6
Africa
9
509.7
North America
138
509.8
South America
32
509.9
Pacific
25
509.00
4
509.01
10
509.02
32
509.03
Early Modern
103
509.04
20th Century
68
509.05
21st Century
5
509.06509.07
1
509.08509.09
1
509.040509.041
1910-1919
3
509.042
1920-1929
1
509.043509.044
1940-1949
2
509.045
1950-1959
3
509.046
1960-1969
2
509.047
1970-1979
1
509.048509.049
1990-1999
2

Works under MDS 509.04

1–50 of 65 ( 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.

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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