1Based on the book Eric Liddell, Something Greater Than Gold. These guides provide the Christian school teacher and homeschooling parent with ways to use the book as a vehicle for teaching and reinforcing many curriculum areas including geography, history, and world missions. Each Christian Heroes unit study curriculum guide corresponds with the book from the Christian Heroes: Then & Now series. Designed for both group and individual study, reflective of a wide range of learning styles, suitable for a range of grade levels and abilities, with reproducible fact sheet and maps.