Wikimedia Commons has media related to Classification systems by subject.
Subcategories
This category has the following 35 subcategories, out of 35 total.
A
C
E
G
L
M
P
- Patent classifications (9 P)
- Pulitzer Prizes by category (28 P)
R
S
T
- Travel classes (9 P)
V
W
Pages in category "Classification systems by subject"
The following 32 pages are in this category, out of 32 total. This list may not reflect recent changes.