Roughing It and Life on the Mississippi are good reads. Roughing It has an image in it that recurs to me frequently and makes me laugh: he's riding west in a wagon coach and at night they close the windows, which makes the place absolutely dark, and they sleep that way while the wagon bangs along. One of his fellow passengers is an encyclopedia salesman, IIRC, and one night a volume of his samples escapes and starts bounding around. Unfortunately, because it's so dark no one can avoid it much less catch it and tie it down until it's done considerable damage. One man said it hit his nose and bent it so far backward he was looking down his own nostrils.