Classification
000 - Computer science, information & general works
1
004 - Data processing & computer science
20
005 - Computer programming, programs & data
9
331 - Labor economics
13
374 - Adult education
35
384 - Communications; telecommunication
7
500 - Natural sciences & mathematics
3
620 - Engineering & allied operations
1
621 - Applied physics
6
929 - Genealogy, names & insignia
1