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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
174,831
ℹ️
1
Philosophy and Psychology
162,225
πŸ’­
2
Religion
426,300
πŸ™πŸ½
3
Social Sciences
883,845
πŸ‘«
4
Language
118,460
πŸ’¬
5
Mathematics and Science
274,822
πŸ”¬
6
Technology
640,979
πŸ’‘
7
Arts and Recreation
654,095
🎨
8
Literature
868,418
πŸ“š
9
Biography and History
553,223
πŸ—Ώ
50
General Science
23,134
πŸ”¬
51
Mathematics
51,434
βž—
52
Astronomy
15,272
🌌
53
Physics
26,427
🍎
54
Chemistry
15,675
βš—
55
Earth sciences & geology
24,794
🌎
56
Fossils & prehistoric life
6,072
πŸ’€
57
Life Sciences
36,865
🐠
58
Botany
15,518
🌿
59
Zoology
59,631
🐼
500
General Science
7,105
πŸ”¬
501
Theory And Instruction
2,614
502
Miscellany
997
πŸ‘
503
Dictionaries And Encyclopedias
574
πŸ“•
504
[No longer in use]
121
🀷
505
Periodicals
155
T
506
Societies
266
507
Education And Research
3,136
508
Natural history
5,107
509
Biography And History
3,059
βŒ›
509.0
By Period
214
T
509.1
Other Geographic Classifications
44
509.2
Biography
796
509.3
Ancient World
78
509.4
Europe
288
509.5
Asia
86
509.6
Africa
8
509.7
North America
134
509.8
South America
29
509.9
Pacific
22
509.00
4
509.01
10
509.02
32
509.03
Early Modern
94
509.04
20th Century
67
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 64 ( 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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