Skip to Main Content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

LC Classification: Q

A breakdown of the Library of Congress Classification system

Q - Overview

Q - Science (General)

QA - Mathematics

QB - Astronomy

QC - Physics

QD - Chemistry

QE - Geology

QH - Natural history - Biology 

QK - Botany

QL - Zoology

QM - Human anatomy

QP - Physiology

QR - Microbiology

For Further Details

For more detailed information, visit the Library of Congress Classification Outline.

Q - Science

Q - Science (General)

  • Q1-295 General
  • Q300-390 Cybernetics. Information theory

QA - Mathematics

  • QA47-59 Tables
  • QA71-90 Instruments and machines
  • QA101-145 Elementary mathematics. Arithmetic
  • QA150-272.5 Algebra
  • QA273-280 Probabilities. Mathematical statistics
  • QA299.6-433 Analysis
  • QA440-699 Geometry. Trigonometry. Topology
  • QA801-939 Analytic mechanics

QB - Astronomy

  • QB140-237 Practical and spherical astronomy
  • QB349-421 Theoretical astronomy and celestial mechanics
  • QB495-903 Descriptive astronomy
    • QB500.5-785 Solar system
    • QB799-903 Stars

QC - Physics

  • QC120-168.85 Descriptive and experimental mechanics
  • QC221-246 Acoustics. Sound
  • QC251-338.5 Heat
  • QC350-467 Optics. Light
  • QC501-766 Electricity and magnetism
  • QC770-798 Nuclear and particle physics. Atomic energy. Radioactivity
  • QC851-999 Meterology. Climatology

QD - Chemistry

  • QD71-142 Analytical chemistry
  • QD146-197 Inorganic chemistry
  • QD241-441 Organic chemistry
  • QD450-801 Physical and theoretical chemistry
  • QD901-999 Crystallography

QE - Geology

  • QE351-399.2 Mineralogy
  • QE420-499 Petrology
  • QE500-639.5 Dynamic and structural geology
  • QE701-760 Paleontology
  • QE760.8-899.2 Paleozoology
  • QE901-966.5 Paleobotany

QH - Natural history - Biology 

  • QH1-278.5 Natural history
    • QH201-278.5 Microscopy
  • QH301-705.5 Biology
    • QH359-425 Evolution
    • QH426-470 Genetics
    • QH471-489 Reproduction
    • QH501-531 Life
    • QH540-549.5 Ecology

QK - Botany

  • QK474.8-495 Spermatophyta. Phanerogams
  • QK504-638 Cryptogams
  • QK640-707 Plant anatomy
  • QK710-899 Plant physiology
  • QK900-989 Plant ecology

QL - Zoology

  • QL360-599.82 Invertebrates
  • QL605-739.8 Chordates. Vertebrates
  • QL750-795 Animal behavior
  • QL801-950.9 Anatomy
  • QL951-991 Embryology

QM - Human anatomy

  • QM1-511 General
  • QM531-549 Regional anatomy
  • QM550-577.8 Human and comparative histology
  • QM601-695 Human embryology

QP - Physiology

  • QP351-495 Neurophysiology and neuropsychology
  • QP501-801 Animal biochemistry
  • QP901-981 Experimental pharmacology

QR - Microbiology

  • QR75-99.5 Bacteria
  • QR100-130 Microbial ecology
  • QR171 Microorganism in the animal body
  • QR180-189.5 Immunology
  • QR355-502 Virology