. Ecological investigations upon the germination and early growth of forest trees . Fig. I. The effect of soil texture upon the development of Pinus pon- derosa (S. D.). Ten plants each (i) grown m loam, (2) grovi^n in sand, (3) grown in gravel. ^ natural size.

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlincolnneb, booksub