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Sargent, Manual.
Britton.
Roth, Timber.
Hough, Handbook.
Keeler.
Apgar.
Mohr. For. Bull., No. 22.
Fernow, Forestry Investigations.
Lumber Trade Journals.
Baterden.
Sargent, Silva.
Sargent, Forest Trees, 10th Census, Vol. IX.
Boulger.
Hough, American Woods.
Snow.
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