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12. Men of earth
13. The biological control of insects: with a chapter on weed control
14. Humus: origin, chemical composition, and importance in nature
15. Mother earth: being letters on soil addressed to Professor R. G. Stapledon
16. Bio-dynamic farming and gardening: soil fertility renewal and preservation
17. Silos and silage
18. Friend earthworm: practical application of a lifetime study of habits of the most important animal in the world
19. Food or famine: the challenge of erosion
20. Pay dirt: farming & gardening with composts
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