Variant of CIP 2000 - NGS University-level Historical Groupings
- 7 - Physical Sciences, Mathematics and Computer Sciences
- 71 - Physics, Chemistry, Geology and Related Sciences
- 40. - Physical Sciences
- 40.08 - Physics
- 40.0801 - Physics, General
- 40.0802 - Atomic/Molecular Physics
- 40.0804 - Elementary Particle Physics
- 40.0805 - Plasma and High-temperature Physics
- 40.0806 - Nuclear Physics
- 40.0807 - Optics/Optical Sciences
- 40.0808 - Solid State and Low-temperature Physics
- 40.0809 - Acoustics
- 40.0810 - Theoretical and Mathematical Physics
- 40.0899 - Physics, Other
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