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LYON, T. LYTTLETON and ELMER O. FIPPIN. The Principles of Soil Management. Ninth Edition. NY, Macmillan, 1914 (c1909, 1914) xxxiii, 531pp +8pp ads, illustrations, charts, maps, index, (Macmillan Rural Text-Book Series) bound green cloth with gold and black lettering and decoration, rubbed at extremities. Contents includes: The Soil as a Medium for Root-Development; The Soil as a Reservoir for Water; Plant Nutrients of the Soil; Organism in the Soil; The Soil-Air; Heat of the Soil; External Factors in Soil-Management.