. Bulletin. Agricultural experiment stations -- United States; Agriculture -- United States. U. S. Dept. of Agf., Bui. 171, Office of Expt. Stations. Plate Fig. 1.—Castilloa Rubber Trees of Same Age in Fertile Loam and Heavy Clay 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 United States. Office of Experiment Stations. Washington : G. P. O.

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