Haku
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Chemical weed control in Finland in 1887-1965
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1969)
The biomass of weeds in winter cereal fields in Finland
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1985)
Studies on the biology and control of marsh horsetail (Equisetum palustre L.)
(Agricultural Research Centre, 1963)