Instructions for City of LA:
Use This link to Navigate LA http://eng.lacity.org/index.cfm (Look under Quick Links)

Once you are in Navigate LA, use the pull down menu to go to “Vault” and the city’s grid will appear on the map along with a popup (turn off your blocker) for the Electronic Vault will appear as well. You zoom in on the Nav LA site to find your site. Hover the mouse in one spot to find out the grid (XXXbXXX – where X’s are numbers). Go to the vault website and change the pull down to FB (Field Books). Enter the grid from NAV LA in his format: XXX-XXX (replacing b with -). Find the index sheet – usually page 99 and it’s pretty easy to figure it out from there.