Q
Q | Science (General) |  | QA | Mathematics |  |
QB | Astronomy |  |
QC | Physics |  |
QD | Chemistry (General) |  |
QE | Geology |  |
QH | Natural History & Biology |  |
QK | Botany |  |
QL | Zoology |  |
QM | Human Anatomy |  |
QP | Physiology |  |
QR | Microbiology |  |
R
R
Medicine (General)
RA
Public Aspects of Health
RB
Pathology
RC
Internal Medicine &
Practice of Medicine
RD
Surgery
RE
Ophthalmology
RF
Otorhinolaryngology
RG
Gynecology & Obstetrics
RJ
Pediatrics
RK
Dentistry
RL
Dermatology
RM
Therapeutics &
Pharmacology
RS
Pharmacy & Materia Medica
RT
Nursing
RV
Botanic, Thomsonian, &
Eclectic Medicine
RX
Homeopathy
RZ
Other
S
S
Agriculture (General)
SB
Plant Culture
SD
Forestry
SF
Animal Culture
SH
Aquaculture,
Fisheries, & Angling
SK
Hunting
T
T
Technology (General)
TA
Engineering
(General) & Civil Engineering
TC
Hydraulic Engineering
TD
Environmental
Technology & Sanitary Engineering
TE
Highway Engineering
TF
Railroad
Engineering and Operation
TG
Bridge Engineering
TH
Building
Construction
TJ
Mechanical Engineering & Machinery
TK
Electrical
Engineering, Electronics, & Nuclear Engineering
TL
Motor Vehicles, Aeronautics, & Astronautics
TN
Mining Engineering &
Metallurgy
TP
Chemical Engineering
Technology
TR
Photography
TS
Manufactures
TT
Handicrafts & Arts and Crafts
TX
Home Economics
U
U
MilitaryScience
(General)
UA
Armies: Organization, Description, Facilities, etc.
UB
Military Administration
UC
Maintenance &
Transportation
UD
Infantry
UE
Cavalry. Armored &
Mechanized Cavalry
UF
Artillery
UG
Military Engineering, Air
Forces & Air Warfare (General)
UH
Other Services
V
V
Naval Science (General)
VA
Navies: Organization, Description, Facilities, etc.
VB
Naval Administration
VC
Naval Maintenance
VD
Naval Seaman
VE
Marines
VF
Naval Ordnance
VG
Minor Services of
Navies
VK
Navigation & Merchant Marine
VM
Naval Architecture,
Shipbuilding, & Marine Engineering
