LIBRARY WORLD 

Library World is the Online Public Access Catalog (OPAC)
Tri-Valley subscribes to. Materials catalogued into the Tri-Valley OPAC can be searched by title, author, and subject.
Search Library World on your PC: Library Catalog
The library name is trivalley. There is no password.      
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Mobile Apps
Library World Search for Apple and Android lets you search your library from
anywhere and anytime you have access to your smart mobile devices.
Available from Apple's App Store and Android Market for free today!   
Library World Search for iPhone
Library World Search for iPad    
Library World Search for Android