Field crop diseases handbook /Author: Nyvall, Robert F.
Publisher: New York : Van Nostrand Reinhold,
Date: c1989. This title can be found in 1 Iowa libraries.
Field crop diseases handbook /Author: Nyvall, Robert F.
Publisher: Westport, Conn. : AVI Pub. Co.,
Date: c1979. This title can be found in 4 Iowa libraries.
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