Classification
340 - Law
2
501 - Philosophy & theory
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
120 - Epistemology, causation & humankind
1
140 - Specific philosophical schools
1
170 - Ethics
1
320 - Political science
1
330 - Economics
1
331 - Labor economics
1
363 - Other social problems & services
1
370 - Education
1
518 - Numerical analysis
1
539 - Modern physics
1
570 - Life sciences; biology
1
572 - Biochemistry
1
577 - Ecology
1
629 - Other branches of engineering
1
631 - Techniques, equipment & materials
1
641 - Food & drink
1
664 - Food technology
1
700 - The arts; fine & decorative arts
1
791 - Public performances
1
900 - History & geography
1
910 - Geography & travel
1
973 - United States
1