I reread the L & C Journals every 3 or 4 years. Went to the Portland Historical Society exhibit of over 400 artifacts pertaining to the journey. Amazing history and sad ending to many on the expedition.
I used to but it's been a while since my last reading. I'd love to find (or gain access to) some of the other L & C scholars like Reuben Thwaites' "Original Journals of the Lewis and Clark Expedition," the Coues edition of Biddle, etc. I'd also dearly love to know more about some Expedition members like John Ordway and especially George Drewyer (Drouillard?) 'Drewer' was ultimate the Mountain Man archetype. But it was John Colter who stayed in the mountains and discovered (for Europeans) Colter's Hell -- Yellowstone.