Materia
T Technology (General)
233
L Education (General)
79
H Social Sciences (General)
51
LB2300 Higher Education
51
HF Commerce
18
LC Special aspects of education
15
HD28 Management. Industrial Management
13
Q Science (General)
13
HB Economic Theory
11
TA Engineering (General). Civil engineering (General)
11
HD Industries. Land use. Labor
10
ZA Information resources
10
HG Finance
9
HM Sociology
9
LB Theory and practice of education
8
R Medicine (General)
7
ZA4050 Electronic information resources
7
G Geography (General)
6
LC5201 Education extension. Adult education. Continuing education
6
S Agriculture (General)
6
BF Psychology
5
HC Economic History and Conditions
5
K Law (General)
5
QA76 Computer software
5
GE Environmental Sciences
4
RA Public aspects of medicine
4
RA0421 Public health. Hygiene. Preventive Medicine
4
SF Animal culture
4
TC Hydraulic engineering. Ocean engineering
4
BJ Ethics
3
HE Transportation and Communications
3
HF5601 Accounting
3
LB1501 Primary Education
3
LB1603 Secondary Education. High schools
3
QR355 Virology
3
RT Nursing
3
TD Environmental technology. Sanitary engineering
3
HA Statistics
2
HN Social history and conditions. Social problems. Social reform
2
JA Political science (General)
2
LE Individual institutions (America except United States)
2
P Philology. Linguistics
2
PN Literature (General)
2
QL Zoology
2
RS Pharmacy and materia medica
2
RZ Other systems of medicine
2
SB Plant culture
2
T201 Patents. Trademarks
2
TK Electrical engineering. Electronics Nuclear engineering
2
V Naval Science (General)
2
más ...