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by U.S. Dept. of Agriculture
by Us Dept. of Agriculture; Chambers, Jackson
by Carver, George Washington; U.s. Dept. of Agriculture; Chambers, Roger
by New York Agricultural Experiment Station; U.s. Dept of Agriculture
by U.s. Dept. of Agriculture; Chambers, Roger
by U.s. Dept. of Agriculture; Chambers, Jackson
by Agriculture, Us Dept. of; Chambers, Sam