You've probably wondered what the best place for farming blueprints might be.
The answer is:
(http://i42.tinypic.com/ofygqu.png)
Located just a bit north-west from Modoc, this square stands out because:
1) the only encounters on it are: a) ants, b) radscorpions, c) ants and radscorpions, which means that even a low level character can use this square with practically no risk of dying;
2) 100% of encounters on this square are city ruins encounters, and that means you don't get to waste even a second of your precious time visiting regular encos where you would have no chance of finding a footlocker;
3) you encounter only small city ruins maps here, which means no need to waste more time than absolutely necessary when running to a footlocker from the place where you spawn;
4) since the mobs here are so weak, you don't have to worry about killing/avoiding them, you can simply rush to the locker right away and there is virtually no chance of them killing you, unlike in the case of many other similar zones, which saves you a lot of time, especially in the long run!
Even if you are not interested in blueprints, there are many more useful items that can be found inside the footlockers quite often, such as for example:
(http://i42.tinypic.com/2iv1gdd.png)
Why am I sharing this extremely useful piece of knowledge with you?
Here comes your answer:(http://i41.tinypic.com/rml3br.png)
I simply have all the blueprints I need already. Enjoy!