Forest Soils Committee of the Douglas Fir Region. (1957). An introduction to forest soils of the Douglas-fir region of the Pacific Northwest. Western Forestry and Conservation Association.
Citace podle Chicago (17th ed.)Forest Soils Committee of the Douglas Fir Region. An Introduction to Forest Soils of the Douglas-fir Region of the Pacific Northwest. Portland 4, Or.: Western Forestry and Conservation Association, 1957.
Citace podle MLA (8th ed.)Forest Soils Committee of the Douglas Fir Region. An Introduction to Forest Soils of the Douglas-fir Region of the Pacific Northwest. Western Forestry and Conservation Association, 1957.
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