Buried Treasure, Roots and Tubers
By Meredith Sayles Hughes
This series provides a wealth of information on each topic. Discussing foods which grow in the ground can be tricky because some are roots, some modified stems, some leaves, etc. This book handles those issues nicely by just addressing roots and tubers. The book covers five topics in some detail the last of which is divided into three root crops.
ISBN:0-8225-2830-4