Hilgard, E. (1919). Soils, their formation, properties, composition, and relation to climate and plant growth in the humid and arid regions. New York: [s.n.].
Chicago Style CitationHilgard, E.W. Soils, Their Formation, Properties, Composition, and Relation to Climate and Plant Growth in the Humid and Arid Regions. New York: [s.n.], 1919.
MLA CitationHilgard, E.W. Soils, Their Formation, Properties, Composition, and Relation to Climate and Plant Growth in the Humid and Arid Regions. New York: [s.n.], 1919.
Warning: These citations may not always be 100% accurate.