Dewey? Dewey? Anybody? Dewey?
All about the Dewey Decimal System
100 Philosophy & psychology
300 Social sciences
500 Natural sciences & mathematics
600 Technology (Applied sciences)
700 The arts
800 Literature & rhetoric
900 Geography & history
For instance, "Diseases" are given the number 616. To see what books the library right now has in on diseases, go to the non-fiction shelf and look at the spin labels of the books to find the numbers 616.