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Cover of The Formation of Vegetable Mould Through the Action of Worms: With Observations on Their Habits

The Formation of Vegetable Mould Through the Action of Worms: With Observations on Their Habits

Charles Darwin

3.0
Cover of Principles and practice of agricultural analysis. Volume 3 (of 3), Agricultural products

Principles and practice of agricultural analysis. Volume 3 (of 3), Agricultural products

Harvey Washington Wiley

2.4
Cover of Principles and practice of agricultural analysis. Volume 2 (of 3), Fertilizers

Principles and practice of agricultural analysis. Volume 2 (of 3), Fertilizers

Harvey Washington Wiley

3.3
Cover of Principles and practice of agricultural analysis. Volume 1 (of 3), Soils

Principles and practice of agricultural analysis. Volume 1 (of 3), Soils

Harvey Washington Wiley

2.2
Cover of Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regions

Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regions

Eugene W. (Eugene Woldemar) Hilgard

2.2
Cover of Crops and Methods for Soil Improvement

Crops and Methods for Soil Improvement

Alva Agee

2.1
Cover of Lessons on Soil

Lessons on Soil

Edward J. (Edward John) Russell

3.7
Cover of The Farm That Won't Wear Out

The Farm That Won't Wear Out

Cyril G. (Cyril George) Hopkins

2.4
Cover of The Story of the Soil; from the Basis of Absolute Science and Real Life

The Story of the Soil; from the Basis of Absolute Science and Real Life

Cyril G. (Cyril George) Hopkins

3.8