Douglass, A. E. (1919). Climatic Cycles and tree-growth.
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Dyfyniad Arddull Chicago
Douglass, Anton Ellicott. Climatic Cycles and Tree-growth. Washington, 1919.
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Dyfyniad MLA
Douglass, Anton Ellicott. Climatic Cycles and Tree-growth. 1919.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.