AC-AZ General Works

 B-BX Philosophy, Psychology, Religion

 C-CT Auxiliary Sciences of History

 D-DH History

 E-F History of the Americas

 G-GB Geography

 GC Oceanography

 GE Environmental Sciences

 H Social Sciences (general)

 HA-HJ Economics and Finance

 HM-HX Sociology, Social Work

 J Political Science

 K-KZ Law

 L-LT Education

 M-MT Music

 N-NX Fine Arts

 P-PZ Language, Literature

 Q Science (general)

 QB-QC Physics, Astronomy

 QD Chemistry

 QE Geosciences

 QH Biology (natural history, genetics)

 QK - Botany (including plant ecology)

 QL Zoology

 QM-QP Anatomy, Physiology

 QR Microbiology (including immunology)

 SD Forestry

 S-SB Agriculture (including soil and plant science)

 SH Fisheries

 SF Animal Science and Veterinary Medicine

 T Technology

 SK Wildlife

 TK Electrical and Computer Engineering

 T-TH General and Civil Engineering

 TN Mining Engineering

 TJ Mechanical Engineering

 U-V Military Science, Naval Sciences

WU Dental Hygiene

 Z-ZA Bibliography, Library Science, Information