| LC CLASS. | SUBJECT | LEVELS |
| **** | Western Hemisphere | *** |
| E11-29 | General | 2b |
| E31-45 | North America | 2b |
| E51-74 | Pre-Columbian America. Indians | 3c |
| E75-99 | Indians of North America | 4 |
| E101-135 | Discovery & Early Exploration | 2b |
| E141-143 | Descriptive Accounts | 2b |
| **** | United States | **** |
| E151-183 | General | 4 |
| E160 | National & State Parks | 3c |
| E169.1-169.5 | Civilization/Popular Culture | 4 |
| E171-183 | History | 4 |
| E171 | Periodicals | 4 |
| E172 | Societies | 4 |
| E173 | Sources & Documents | 4 |
| E175 | Historiography | 4 |
| E181-182 | Military/Naval History | 3c |
| E183 | Political History | 4 |
| E183.7 | Diplomatic History | 4 |
| E183.8 | Relations with: | 3-4 |
| .C2 | Canada | 4 |
| .C5 | China | 4 |
| .F8 | France | 3a |
| .G3 | Germany | 4 |
| .G7 | Great Britain | 4 |
| .J3 | Japan | 4 |
| .M6 | Mexico | 4 |
| .R9 | Russia/Soviet Union | 4 |
| E184.A1 | Elements in the Population | 2-4 |
| .F8 | French | 3a |
| .G3 | Germans | 3c |
| .J3 | Japanese | 3c |
| .J5 | Jews | 4 |
| .M5 | Mexicans | 4 |
| .S2 | Norwegians | 2a |
| .S23 | Swedes | 2a |
| E185 | African-Americans | 4 |
| E185.5-615 | Post-Emancipation Status | 4 |
| **** | By Time Period | **** |
| E186-199 | Colonial History | 3c |
| E201-298 | Revolution | 3c |
| E301-440 | 1775-1861 | 3c |
| E303-310 | Confederation | 3a |
| E311-337 | Washington through Jefferson | 4 |
| E371-440 | Monroe through Buchanan | 3c |
| E441-453 | Slavery in the U.S. | 4 |
| E457-459 | Lincoln | 4 |
| E461-655 | Civil War | 4 |
| E660-738 | 1865-1900 | 4 |
| E740-889 | 20th Century | 4 |
| E902- | 21st Century | 4 |
| **** | United States Local History | **** |
| F1-15 | New England | 3c |
| F16-30 | Maine | 3a |
| F31-45 | New Hampshire | 2a |
| F46-60 | Vermont | 2a |
| F61-75 | Massachusetts | 3c |
| F76-90 | Rhode Island | 2a |
| F91-105 | Connecticut | 3a |
| F106 | Atlantic Coast/Mid-Atlantic States | 3a |
| F116-130 | New York | 3c |
| F131-145 | New Jersey | 3a |
| F146-169 | Pennsylvania | 3c |
| F161-175 | Delaware | 2a |
| F176-190 | Maryland | 2a |
| F191-205 | District of Columbia | 3c |
| F206-220 | The South/South Atlantic States | 4 |
| F221-235 | Virginia | 4 |
| F236-250 | West Virginia | 1b |
| F251-265 | North Carolina | 3a |
| F266-280 | South Carolina | 4 |
| F281-295 | Georgia | 3a |
| F296 | Gulf States | 1b |
| F301 | West Florida | 1b |
| F306 | Florida | 3c |
| F321-335 | Alabama | 3a |
| F336-350 | Mississippi | 3a |
| F351-355 | Mississippi River & Valley | 4 |
| F366-380 | Louisiana | 3c |
| F381-395 | Texas | 3b |
| F396 | Old Southwest. Lower Mississippi Valley | 2a |
| F406-420 | Arkansas | 1b |
| F431-445 | Tennessee | 3a |
| F446-469 | Kentucky | 3a |
| F461-475 | Missouri | 2a |
| F476-485 | Old Northwest & NorthWest Territory | 4 |
| F486-500 | Ohio | 4 |
| F516-520 | Ohio River & Valley | 4 |
| F521-535 | Indiana | 4 |
| F536-550 | Illinois | 4 |
| F551-556 | Great Lakes. Lake Region | 4 |
| F561-575 | Michigan | 4 |
| F576-590 | Wisconsin | 4 |
| F591-596 | The West. Trans-Mississippi | 3c |
| F597 | Northwest. Upper Mississippi Valley | 3c |
| 598 | Missouri River & Valley | 3c |
| F601-615 | Minnesota | 3b |
| F616-630 | Iowa | 3a |
| F631-645 | North Dakota | 1b |
| F646-660 | South Dakota | 1b |
| F661-675 | Nebraska | 2a |
| F676-690 | Kansas | 3a |
| F691-705 | Oklahoma | 3a |
| F721 | Rocky Mountains | 3a |
| F722 | Yellowstone | 2b |
| F726-740 | Montana | 2a |
| F741-755 | Idaho | 1b |
| F756-770 | Wyoming | 2a |
| F771-785 | Colorado | 3c |
| F786-788 | New Southwest. Colorado River | 3c |
| F791-805 | New Mexico | 2b |
| F806-820 | Arizona | 2b |
| F821-835 | Utah | 2b |
| F836-850 | Nevada | 2b |
| F851-855 | Pacific States. Pacific Coast | 3c |
| F856-870 | California | 4 |
| F871-885 | Oregon | 2b |
| F886-F900 | Washington | 3b |
| F901-951 | Alaska | 3b |
| F965 | Territories of the United States (General) | 3c |
| F970 | Insular possessions of the U.S. (General) | 3c |
| DU620-629 | Hawai’i | 3b |