Mt. Lebanon Public
Library
Catalog
Desk
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Books in the non-fiction section are shelved and grouped by subject according to the Dewey Decimal System. This system divides all knowledge into 10 major categories, then continues to break it down into increasingly smaller categories.
To find books on a particular subject, look under the corresponding Dewey number. If you need more help, ask a librarian at the Reference Desk.
| 000 | Generalities | 500 | Pure Sciences |
| 010 | Bibliographies | 510 | Math |
| 020 | Library & Information Science | 520 | Astronomy |
| 030 | General Encyclopedias | 530 | Physics |
| 040 | (Not used) | 540 | Chemistry |
| 050 | General Periodicals | 550 | Earth Science |
| 060 | General Organizations & Museums | 560 | Paleontology |
| 070 | Journalism & Publishing | 570 | Life Sciences |
| 080 | Collections | 580 | Botany |
| 090 | Manuscripts and Rare Books | 590 | Zoology |
| 100 | Philosophy | 600 | Applied Sciences & Technology |
| 110 | Metaphysics | 610 | Medicine |
| 120 | Epistemology | 620 | Engineering |
| 130 | Paranormal Phenomena & Occult | 630 | Agriculture |
| 140 | Specific philosophies | 640 | Home Economics |
| 150 | Psychology | 650 | Management |
| 160 | Logic | 660 | Chemical Technologies |
| 170 | Ethics | 670 | Manufacturing |
| 180 | Ancient, Medieval & Oriental Philosophy | 680 | Application-specific Manufacturing |
| 190 | Modern Western Philosophy | 690 | Building |
| 200 | Religion | 700 | Arts |
| 210 | Natural Religion | 710 | Civic & Landscape Art |
| 220 | Bible | 720 | Architecture |
| 230 | Christian Theology | 730 | Sculpture |
| 240 | Christian Moral Theology | 740 | Drawing |
| 250 | Local Church & Religious Orders | 750 | Painting |
| 260 | Social & Ecclesiastical Theology | 760 | Graphic & Printed Art |
| 270 | History & Geography of Church | 770 | Photography |
| 280 | Christian Denominations & Sects | 780 | Music |
| 290 | Non-Christian & Comparative Religion | 790 | Sports & Recreation |
| 300 | Social Sciences | 800 | Literature |
| 310 | Statistics | 810 | American Literature |
| 320 | Political Science | 820 | English Literature |
| 330 | Economics | 830 | Germanic Literature |
| 340 | Law | 840 | French Literature |
| 350 | Public Administration | 850 | Italian Literature |
| 360 | Social Concerns & Services | 860 | Spanish & Portuguese Literature |
| 370 | Education | 870 | Latin Literature |
| 380 | Trade & Commerce | 880 | Classical Greek Literature |
| 390 | Customs, Etiquette, Folklore | 890 | Literature of Other Languages |
| 400 | Languages | 900 | History & Geography |
| 410 | Linguistics | 910 | Travel & Geography |
| 420 | English Language | 920 | Genealogy & Geography |
| 430 | Germanic & Scandinavian Languages | 930 | Ancient History |
| 440 | French | 940 | European History |
| 450 | Italian | 950 | Asian History |
| 460 | Spanish & Portuguese | 960 | African History |
| 470 | Latin | 970 | North American History |
| 480 | Classical Greek | 980 | South American History |
| 490 | Other Languages | 990 | History of Other Areas |