Using the library lookup feature in Zotero, you can see if the TXST library catalog has a copy of a resource.
To add the URL resolver:
- Open Zotero settings > general > locate
- For resolver, select "custom"
- For base URL, paste this link: https://libkey.io/libraries/585/openurl

To locate an item in the TXST library:
- Select the item in Zotero that you want to find in the library
- Click the Lookup button on the right hand toolbar (a grey circle with an arrow inside it)
- Click "Library Lookup"