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Library of Congress Classification System
The Carnegie Library of Pittsburgh uses the Library of Congress Classification System. The Library of Congress offers an overview of the classes. See our Library Subject Guide for more help with Subject Headings.
| Subject Area | LC Class |
| Abortion |
HQ 767 RG 648 RA 1067 |
| Acid Rain | TD 196.A |
| AIDS (Disease) |
RC 607.A RA 644.A |
| Alcoholism |
RC 565
HV 5201-570 |
| Alternative Medicine | R 733 |
| Alzheimer's Disease |
RC 523 RC 524 |
| Animal Rights |
HV 4915
HV 4708 |
| Anorexia Nervosa | RC 552.A |
| Bankruptcy | HG 3760-3769 |
|
Battered Women
Abused Women Wife Abuse | HV 6626 |
| Capital Punishment |
HV 8694-8699 KF 26-92 KF 9227-9725 |
| Child Abuse | HV 713-742 |
| Civil Rights |
JC 571 KF 4750 |
| Cloning | QH 442.2 |
| Communism | HX 626-795 |
| Copyright |
Z 551-656 KF 2992-3093 |
| Copyright (Music) | Z 653 |
| Domestic Abuse (Family Violence) |
HQ 809-809.3 HV 6626 |
| Drug Abuse |
HV 5800-5940, RC 563-568 |
| Drugs | RM 300-RM 671 |
| Drunk Driving | HE 5620.D7 |
| Euthanasia | R 726 |
| Evolution | QH 361-369 |
| Extrasensory Perception (ESP) | BF 1312 |
| Family Violence | HQ 809 - HQ 809.3 |
| Gambling |
GV 1301 HV 6710-6721 |
| Genetic Engineering | QH 442 |
| Gun Control |
HV 436 KF 3941 |
| Hazardous Wastes |
TD 811 HD 4483 KF 3946-3958 |
| Homelessness |
HV 4505-4506 HV 1445 |
| Homosexuality |
RC 558 HQ 75-76.8 |
| Juvenile Delinquency | HV9051-9230.7 |
| Ku Klux Klan |
E 668 HS 2330.K6-2330.K63 |
| Nuclear Arms Control | JX 194.7-1974 |
| Nuclear Energy |
TK 9145-9155 QC 773-792 HD 9698 |
| Nuclear Power Plants | TK 1078 |
|
Nuclear War
Nuclear Weapons | U 263-264 |
| Pollution, Air & Water |
TD174-180, QH541-545 |
| Pornography | HQ471 |
| Poverty |
HV1-4630 HC79.P6 HC110.P6 |
| Prisons | HV8301-9920 |
| Prohibition | HV5088-5099 |
| Prostitution | HQ101-440 |
| Radiation | QC 475 |
| Rape | HV 6558-6569 |
| School Desegregation | LC 212-214 |
| Smoking |
HV 5725-5770 RC 567 |
| STD (Sexually Transmitted Diseases) |
RA 644.U4 RC 200 - RC 203 |
| Substance Abuse | RC 563-568 |
| Suicide |
HV 6543-6548
RC 569 RA 1136 |
| Teenage Pregnancy |
HQ 759
RG 556 |
| Teenage Suicide | HV 6546 |
| Terrorism | JX 6731.T4 |
| Welfare |
HV16-699 KF3720 HC110 |
| Wicca | BF 1566 |
| Witchcraft | BF1562.5-1584 |
