Materia
R Medicine (General)
T Technology (General)
L Education (General)
5
RK Dentistry
4
RT Nursing
3
QR355 Virology
2
TP Chemical technology
2
BF Psychology
1
G Geography (General)
1
HC Economic History and Conditions
1
HD Industries. Land use. Labor
1
HG Finance
1
LB1603 Secondary Education. High schools
1
LB2300 Higher Education
1
LB2361 Curriculum
1
Q Science (General)
1
QH426 Genetics
1
RB Pathology
1
RS Pharmacy and materia medica
1
RZ Other systems of medicine
1
TD Environmental technology. Sanitary engineering
1
ZA Information resources
1