Title: Losing Ground: Environmental Stress and World Food Prospects / Edition 1, Author: Erik P. Eckholm
Title: Introduction to California Soils and Plants: Serpentine, Vernal Pools, and Other Geobotanical Wonders / Edition 1, Author: Arthur R. Kruckeberg
Title: The Chocolate Tree: A Natural History of Cacao / Edition 2, Author: Allen M. Young
Title: The Soul of Soil: A Soil-Building Guide for Master Gardeners and Farmers, 4th Edition / Edition 4, Author: Joseph Smillie