A part of this information was obtained from the 1977 Directory of American Horticulture, published by the American Horticultural Society, Inc., Mount Vernon, Virginia 22121, which also contained information on: (a) major U.S. horticultural organizations, (b) plant societies, (c) horticultural libraries, (d) agricultural extension offices and experiment stations, (e) plant inspection stations, key garden centers, clubs and other useful information.
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