Ata minimum, DeLorme road atlases. They run about 20 bucks a state, and while the topos are nothing like USGS 7.5s, they are better than what you are descibing. Cut out the tourist stuff, and you'll save half the weight/bulk. Fold it up, stuff it in a large ziplock. And you can get new ones as you go and mail home your old ones.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.