Authors & Events
Cally Hall is a geology expert and an author of educational guidebooks that make the subject accessible to a variety of readers. She wrote her first book, a DK Smithsonian Handbook called Gemstones, in 1994. She has also written two science-themed books aimed at younger audiences, Closer Look at Mountains and Closer Look at Forests.
DK Smithsonian Handbook
Visit other sites in the Penguin Random House Network
Stay in Touch
Start earning points for buying books! Just for joining you’ll get personalized recommendations on your dashboard daily and features only for members.