Classification
GUAC - Geography - cartography
GAN - Geosciences - mathematical methods, computer applications
6
GSA - Applied geodesy
2
GSC - Remote sensing
2
UAN - Environment - mathematical methods, computer applications
2
DNC - Internet
1
DOQ - Programming languages - Internet
1
DSA - Computer graphics, image/photo editing
1
DYK - Image processing
1
GAA - Geosciences - reference books
1
GCA - Regional geology
1
LCO - Hydrobiology
1
UPVF - Surface waters - streams, rivers, lakes
1