Classification
DOL - Programming language - Python
67
CEB - Houben - Weyl handbook
38
UCS - Environmental chemistry
34
DYA - Artificial intelligence
32
CBA - Gmelin handbook
27
CELC - Organic synthesis
27
ACE - Germanic languages, Indo-Germanic languages
26
HCR - Imaging techniques in medicine
25
HDF - Brain - anatomy, function, disorders
25
DNC - Internet
23
MWH - Statistics
22
AHK - Scientific work
20
HDE - Neurology - general aspects
20
HDS - Neurophysiology, neuroanatomy
20
LRH - Cytology - methods
20
DYAA - Learning theory, adaptive systems
18
LOH - Genetics - methods
18
DOZ - Programming languages - Other
17
FGN - Nanotechnology
17
MSD - Mathematical methods in physics
17
PBA - Quantum theory
17
HPK - Special pharmacology, drug design
16
DKAE - Windows
15
HDH - Neuropsychology
15
LKH - Biochemistry - methods
15
DMC - Computer programs
14
HBH - Anatomy and cytology of man
14
LON - Molecular genetics
14
UPP - Water pollution
14
CEA - Beilstein handbook
13
CHA - Physical chemistry - comprehensive works
13
DOQ - Programming languages - Internet
13
DOR - Programming languages - JAVA, C#, Mono, .NET
13
HCG - Radiology
13
HDG - Psychology, psychiatry
13
DMF - Software engineering
12
DOO - Programming language - SPSS, R, S etc.
12
FAJ - Solid state physics - introductions
12
LGT - Neurobiology, neurophysiology
12
LKD - Biochemistry - comprehensive works
12
PKA - Elementary particles, nuclei - general
12
CAN - Chemistry - mathematical methods, computer applications
11
CUW - Mass spectroscopy
11
DMA - Programming
11
DOFC - Programming language - C plus-plus
11
DPA - Electronic data processing - applications
11
DSA - Computer graphics, image/photo editing
11
FNPE - Nanostructured materials
11
HVA - Internal medicine - comprehensive works
11
LMN - Molecular biophysics, biophysical chemistry
11
more ...