. Bulletin. Agricultural experiment stations -- United States; Agriculture -- United States. U. S. Dept. of Agr , Bui. 1 30, Office of Expt. Stations. Irrigation Investigations. Plate Fig. 1.— 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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