Use the WTP search code.
Example: wtp=vr
| AN | Analytic |
| AR | Archival Control |
| CS | Audiocassette |
| BT | Beta |
| BI | Biography, Autobiography |
| BK | Book |
| CD | CD |
| CO | Collection |
| CF | Computer File |
| DV | DVD |
| FI | Fiction |
| FL | Film |
| GL | Globe |
| GP | Government Publication |
| IR | Integrating Resource |
| KT | Kit |
| LA | Laserdisc |
| LP | LP |
| MP | Map |
| ME | Media |
| MX | Mixed Material |
| MU | Music |
| SC | Musical Score |
| NW | Newspaper |
| PE | Periodical |
| AV | Projected Medium |
| SE | Serial |
| SR | Series |
| SL | Slide |
| SR | Sound Recording |
| UM | Umatic |
| VH | VHS |
| VR | Videorecording |
| 2D | 2D Nonprojectable Graphic |
| 3D | 3D Artifact |