Classification
YPG - Business management
263
YPGE - Human resource planning, human resource management
172
TAT - Engineering Standards
169
YFA - Labour legislation
165
TEA - Electrical engineering - general
162
HDG - Psychology, psychiatry
150
AHP - Philosophy
139
YRB - Social sciences, sociology
130
THK - Joining - welding, brazing, soldering
128
TKJ - Traffic
125
YRA - Social studies
124
TKB - Civil engineering - buildings
110
TND - Gas cooled reactor types
106
UA - Environment - general
105
YPB - Economy - general aspects
104
DNC - Internet
100
THA - Mechanical engineering - general
95
EWA - Energy economy
94
AMA - Education - general
93
EXA - Energy policy
89
CWE - Chemical engineering, chemical industry - general
87
AFG - Large scale research institutions (Helmholtz Centres)
83
THD - Design and construction in mechanical engineering
83
TNO - Nuclear reactor safety
82
YBB - Law - general
80
THQ - Fluid mechanics and dynamics
75
YRC - Technology and society
75
PAD - Physics - comprehensive works
74
TKA - Civil engineering - general
72
EPK - Nuclear energy
71
EHA - Renewable energy sources
70
TIE - Process engineering
69
AHK - Scientific work
68
DMC - Computer programs
67
AHF - Research and science
66
UMV - Climatic change
66
ABD - National biographic catalogues - Germany
65
AHN - Media and communication science
64
ACE - Germanic languages, Indo-Germanic languages
63
TIG - Reliability, safety, quality control
63
YPD - Business economics
63
TGN - Control engineering
62
YZA - Politics, political science
62
TNA - Nuclear engineering - general
61
YDS - Building law
59
YHA - Industrial property law, licensing rights
59
TAA - Engineering sciences - reference books
58
TNJ - Nuclear reactor technology
58
THP - Pressure vessels, boilers, pipes
57
YDX - Contract law
57
more ...