Classification
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510 - Mathematics
1
511 - General principles of mathematics
1
518 - Numerical analysis
1
523 - Specific celestial bodies & phenomena
1
535 - Light & infrared & ultraviolet phenomena
1
643 - Housing & household equipment
1
646 - Sewing, clothing & personal living
1
657 - Accounting
1
720 - Architecture
1
745 - Decorative arts
1
808 - Rhetoric & collections of literature
1
809 - History, description & criticism
1
813 - American fiction in English
1
986 - Colombia & Ecuador
1