. Ecological investigations upon the germination and early growth of forest trees. Trees; Germination; Growth (Plants). Fig. I. The germination curves of Pinus pondcrosa (S. D.).. Fig. 2. The germination curves of Pinus Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Boerker, Richard Hans Douai, 1887-. Lincoln, Neb

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