| Classification | Description |
| 000-190 | Bibliography |
| 200-299 | Religion |
| 300-400 | Immigration, hereditary societies |
| 400-920 | Dictionaries, travel, atlases, biography |
| 929 | General treatises, e.g.: "the art of searching for one's ancestors" |
| 929.1 | General Genealogy, including U.S. and U.S. general-special, e.g., "American marriage records" |
| 929.1 I68 | Irish in the United States |
| 929.1 Q1 | Quaker Genealogy |
| 929.11 | Lineage books, e.g.: Daughters of the American Revolution |
| 929.2 | Families and books on particular surnames: A-Z |
| 929.3 | States of the United States |
| 929.3 A3 | Alabama |
| 929.3 A4 | Alaska |
| 929.3 A5 | Arizona |
| 929.3 A7 | Arkansas |
| 929.3 C2 | California |
| 929.3 C5 | Colorado |
| 929.3 C7 | Connecticut |
| 929.3 D3 | Delaware |
| 929.3 D6 | District of Columbia |
| 929.3 F6 | Florida |
| 929.3 G3 | Georgia |
| 929.3 H3 | Hawaii |
| 929.3 I2 | Idaho |
| 929.3 I3 | Illinois |
| 929.3 I5 | Indiana |
| 929.3 I6 | Iowa |
| 929.3 K2 | Kansas |
| 929.3 K3 | Kentucky |
| 929.3 L8 | Louisiana |
| 929.3 M2 | Maine |
| 929.3 M3 | Maryland |
| 929.3 M4 | Massachusetts |
| 929.3 M5 | Michigan |
| 929.3 M6 | Minnesota |
| 929.3 M7 | Mississippi |
| 929.3 M8 | Missouri |
| 929.3 M9 | Montana |
| 929.3 N2 | Nebraska |
| 929.3 N3 | Nevada |
| 929.3 N4 | New Hampshire |
| 929.3 N5 | New Jersey |
| 929.3 N6 | New Mexico |
| 929.3 N7 | New York |
| 929.3 N8 | North Carolina |
| 929.3 N9 | North Dakota |
| 929.3 O3 | Ohio |
| 929.3 O4 | Oklahoma |
| 929.3 O6 | Oregon |
| 929.3 P4 | Pennsylvania |
| 929.3 R4 | Rhode Island |
| 929.3 S5 | South Carolina |
| 929.3 S7 | South Dakota |
| 929.3 T2 | Tennessee |
| 929.3 T4 | Texas |
| 929.3 U8 | Utah |
| 929.3 V5 | Vermont |
| 929.3 V8 | Virginia |
| 929.3 W2 | Washington |
| 929.3 W5 | West Virginia |
| 929.3 W8 | Wisconsin |
| 929.3 W9 | Wyoming |
| 929.31 | Regional (groups of states) |
| 929.31 N53 | New England |
| 929.31 S7 | Southern states |
| 929.31 S72 | Old Southwest |
| 929.31 S73 | New Southwest |
| 929.31 P2 | Pacific |
| 929.3438 | How to Find Your Polish Ancestry |
| 929.347 | Shtetl Finder (Jews in Russia, Poland, and other European countries) |
| 929.371 | Canadian |
| 929.372 | Mexico; Mexico and Central America |
| 929.373 | Central and South American, Latin America |
| 929.4 | Names, e.g.: meaning of names |
| 929.6 | Heraldry |
| 929.7 | Peerage |
| 929.8 | World History |
| 970.1 | Native American |
| 973.74 | Tracing Your Civil War Ancestor |