Materia
SB Plant culture
S Agriculture (General)
53
SD Forestry
26
SF Animal culture
15
QL Zoology
14
Q Science (General)
11
QK Botany
10
G Geography (General)
5
QD Chemistry
5
TP Chemical technology
5
QH301 Biology
4
GE Environmental Sciences
3
HD28 Management. Industrial Management
3
QR Microbiology
2
SH Aquaculture. Fisheries. Angling
2
T Technology (General)
2
GV Recreation Leisure
1
H Social Sciences (General)
1
HA Statistics
1
HB Economic Theory
1
HD Industries. Land use. Labor
1
HT Communities. Classes. Races
1
L Education (General)
1
QP Physiology
1
QR180 Immunology
1
R Medicine (General)
1
RV Botanic, Thomsonian, and eclectic medicine
1
TD Environmental technology. Sanitary engineering
1
TS Manufactures
1
TX Home economics
1