TY  - BOOK
AU  - THOR KOMMEDAHL
AU  - WILLIAMS PAUL H.
TI  - CHALLENGING PROBLEMS IN PLANT HEALTH
AV  - SB 731.C493 1983 
PY  - 1983///
CY  - ST PAUL MINNESOTA
PB  - AMERICAN PHYTOPATHOLOGICAL SOCIETY
KW  -  American Phytopathological Society. Plant diseases. Plants, Protection of. Plant health
ER  -