Alpine County does not have anything online.  I purchased all their APN index maps, APN maps and recorded maps.  You will first want to click on the file named “County Index – Start Here”.  After looking at that index map, it will tell you what book for your location of interest.  Then click on the appropriate book links below.  In those files are sub-index maps, keep digging down until you find the APN map displaying your location of interest.  The APN map will then reference your recorded map.  I have organized the recorded maps by numerical order.  Enjoy!