A really well-written book. This is not a children's book as it lists. It can be easily read by a teen or adult, but certainly not the 4 to 8 catagory. Very enjoyable biography of one of the members of the survey party that helped make Yellowstone National Park a reality. Text flows and is not dry or too detailed (but detailed enough for a good picture of his life). Has lots of B/W prints of his artwork and period photos. Also has several pages of color plates with his artwork. He was not only a good photographer who happened to be in the right place at the right time, but a very talented artist. I highly recommend this book.