Classification
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003 - Systems
1
004 - Data processing & computer science
1
153 - Mental processes & intelligence
1
204 - Religious experience, life & practice
1
320 - Political science
1
330 - Economics
1
331 - Labor economics
1
332 - Financial economics
1
336 - Public finance
1
342 - Constitutional & administrative law
1
346 - Private law
1
355 - Military science
1
364 - Criminology
1
371 - Schools & their activities; special education
1
372 - Elementary education
1
502 - Miscellany
1
509 - Historical, geographic & persons treatment
1
530 - Physics
1
543 - Analytical chemistry
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
624 - Civil engineering
1
651 - Office services
1
657 - Accounting
1
690 - Buildings
1
697 - Heating, ventilating & air-conditioning
1
720 - Architecture
1