Aphids on Norway and other ornamental spruces.
Great Britain.Forestry Commission.
Great Britain.Department of the Environment.Directorate of Rural Affairs.
Tree Advice Trust.
Arboricultural Advisory and Information Service (Great Britain)
Farnham : Arboriculture Advisory and Information Service,
1993.
Caption title.
"Produced by the Forestry Commission under the auspices of the Department of the Environment's Directorate of Rural Affairs and issued by the Arboricultural Advisory and Information Service"
At head of title: The Tree Advice Trust.