Dewey Decimal Classification (DDC)
Reference Sheets

Selected Benner Library General Reference Sources (relevant to many topics)

Selected Subject-specific Reference Sources (click on # to see the list):

000: Generalities, Library science, Computer science, & Journalism
100: Philosophy & psychology
200: Religion
300: Social sciences
400: Language
500: Natural sciences & mathematics
600: Technology-applied sciences
700: The arts
800: Literature & rhetoric
900: Geography & history