Through the Brazilian Wilderness
by Teddy Roosevelt.
Your students can obtain and read the book on Google Books
and follow the book and Teddy Roosevelt's explorations in this MyReadingMapped
page referenced Google Earth map
based on the book.
A while back someone from the Roosevelt family, who's name I cannot remember, actually wrote and thanked me for creating the map.
The recent Fair Use court ruling regarding Google Books should allow your students to read and use the map without any legal concerns.