TY  - BOOK
AU  - Bonde, Reiner
AU  - Raleigh, W.P.
AU  - Schultz, E.S.
TI  - Rate of spread and effect on yield of potato virus diseases
T2  - (Bulletin; 421)
PY  - 1943///
CY  - Orono
PB  - Maine Agricultural Experiment Station
ER  -