This is a fairly light history of the Lewis and Clark expedition, very narrative in nature, and relying heavily on direct quotes from journals, which is interesting, but I don't always find that he gives good context. When several pages at a time are the journals, why not just have the journals?
And wow, gender stereotypes. When writing that it is recorded several times that Sacajawea cooked a meal, he writes something like "it is hard not assume that she just loved fussing about with the cooking." Uh-huh. Nice leap.
At any rate, this one isn't for historians. It's light popular history, a quick read, and that's about it.