Vault Dweller's Survival Guide is the manual for the original Fallout. You can download a copy of it here.
If you see the flash, duck and cover!
Always test the air for radiologicals and viruses. A containment suit is your best friend!
Glowing objects are to be considered dangerous at all times. If an object has enough illuminosity to read at night, do not touch!
In the event of exposure to radiation, you must shower with a large amount of water as soon as possible. Lather, rinse and repeat.
Proper latrine building is an important outdoor survival skill. Practice this skill as often as possible.
In the event of fire, do not run! It will force the flames up to your head. Stop, drop and roll!
Don’t let this happen to you! Proper weapon maintenance will stop over 95% of all critical failures!