| Title | Information |
|---|---|
| U.S. Serial Set (1789-1969) | |
| Ullmann's Encyclopedia of Industrial Chemistry | |
| Ulrichsweb | |
| United States Patent and Trademark Office (1790-) | |
| Urban Studies Abstracts | |
| US Government Publications (1976-) |
| Title | Information |
|---|---|
| U.S. Serial Set (1789-1969) | |
| Ullmann's Encyclopedia of Industrial Chemistry | |
| Ulrichsweb | |
| United States Patent and Trademark Office (1790-) | |
| Urban Studies Abstracts | |
| US Government Publications (1976-) |