Nyvall, Robert F .
Field crop diseases handbook / Textual Documents Robert F Nyvall. - Connecticut : A.V.I Publishing company , 1979. - 436 ; .
028.71632 / NYV/FI
Field crop diseases handbook / Textual Documents Robert F Nyvall. - Connecticut : A.V.I Publishing company , 1979. - 436 ; .
028.71632 / NYV/FI