I started reading this tome on my Kindle, but I didn't finish before my book club discussion. So, I switched to Audible version, which allowed me to listen while accomplishing other tasks. I'm giving the book four stars because about the Lewis and Clark Expedition is expansive. I learned more about the conditions and experiences the explorers had to endure. It is fascinating to consider what they were able to accomplish and how their discoveries affected our country. Readers, please have courage and do not be daunted by the time it takes to read this well-written account!