Soils — Audiobooks
Principles and practice of agricultural analysis. Volume 2 (of 3), Fertilizers
by Harvey Washington Wiley
Crops and Methods for Soil Improvement
by Alva Agee
The Farm That Won't Wear Out
by Cyril G. (Cyril George) Hopkins
Principles and practice of agricultural analysis. Volume 1 (of 3), Soils
by Harvey Washington Wiley
The Formation of Vegetable Mould Through the Action of Worms With Observations on Their Habits
by Charles Darwin
The Story of the Soil; from the Basis of Absolute Science and Real Life
by Cyril G. (Cyril George) Hopkins
Lessons on Soil
by Edward J. (Edward John) Russell
Principles and practice of agricultural analysis. Volume 3 (of 3), Agricultural products
by Harvey Washington Wiley
The soil solution : The nutrient medium for plant growth
by Frank K. (Frank Kenneth) Cameron
Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regions
by Eugene W. (Eugene Woldemar) Hilgard