Dual index
Where knowledge meets industry
Each crawled page sits in a Dewey class and a NAICS sector. The matrix is the live crosswalk of this index — click a cell to search that pairing.
| DDC \ NAICS | 11 | 21 | 22 | 23 | 31-33 | 42 | 44-45 | 48-49 | 51 | 52 | 53 | 54 | 55 | 56 | 61 | 62 | 71 | 72 | 81 | 92 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 000 | 6 | 4 | ||||||||||||||||||
| 100 | 1 | 1 | ||||||||||||||||||
| 200 | 1 | 1 | ||||||||||||||||||
| 300 | 2 | 2 | 1 | 1 | 3 | 1 | 6 | 1 | 2 | 1 | 15 | |||||||||
| 400 | 1 | 1 | ||||||||||||||||||
| 500 | 1 | 6 | 1 | 1 | 1 | |||||||||||||||
| 600 | 4 | 1 | 5 | 1 | 1 | 2 | 5 | 2 | 2 | 2 | ||||||||||
| 700 | 4 | 1 | 3 | |||||||||||||||||
| 800 | 1 | 2 | ||||||||||||||||||
| 900 | 4 | 1 |
Strongest pairings
- 300 Social sciences→92 Public Administration15 pages
- 000 Computer science, information & general works→51 Information6 pages
- 300 Social sciences→52 Finance and Insurance6 pages
- 500 Science→54 Professional, Scientific, and Technical Services6 pages
- 600 Technology→54 Professional, Scientific, and Technical Services5 pages
- 600 Technology→31-33 Manufacturing5 pages
- 000 Computer science, information & general works→54 Professional, Scientific, and Technical Services4 pages
- 600 Technology→11 Agriculture, Forestry, Fishing and Hunting4 pages
- 700 Arts & recreation→51 Information4 pages
- 900 History & geography→51 Information4 pages
- 300 Social sciences→48-49 Transportation and Warehousing3 pages
- 700 Arts & recreation→71 Arts, Entertainment, and Recreation3 pages