If you've been waiting for an official means of recovering your Verizon or Sprint Galaxy Nexus should an emergency arise, Google's just fulfilled that need. The factory images for both devices – 4.2.2 (JDQ39) for the Verizon variant and 4.2.1 (GA02) for Sprint's – just hit the "Factory Images for Nexus Devices" download page.
These images allow you to return your device back to its stock state, which includes the stock bootloader and recovery if you choose to flash it. If you root, ROM, and/or tinker, it's a good idea to have these handy – you never know when you might need them. Follow the links below to grab the latest.