Proceedings of symposia
International Congress of Plant Protection, 9th, Washington,
Proceedings of symposia - Minneapolis Burgess Pub. 1981 - 28cm; 2v.
PLANTS PROTECTION OF -- CONGRESSES
PLANTS PROTECTION OF -- CONGRESSES
632 I-5P
Proceedings of symposia - Minneapolis Burgess Pub. 1981 - 28cm; 2v.
PLANTS PROTECTION OF -- CONGRESSES
PLANTS PROTECTION OF -- CONGRESSES
632 I-5P