Rocks in His Head by Carol Otis Hurst, pictures by James Stevenson
Based on the true story of the author's father, this book is a fantastic addition to a geology study. He loved rocks from the time he was a young boy, collecting and studying them his entire life. Every few pages the phrase "rocks in his head" repeats, to which her father always agreeably replies, "Maybe I do."
There's a little history (the rise of the automobile and the Great Depression) in addition to the geology, but most importantly is his humility and quiet perseverance. His rocks give him a steady joy, even when faced with struggles. In this end, his dedication to his passion and his never-ending quest for more knowledge earn him his dream job.