. Properties of tree barks in relation to their agricultural utilization. Bark Utilization. Figure 11. — Effect of bark and sawdust on growth of sunflower plants. 14. 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 Bollen, W. B. (Walter Beno), 1896-. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity