| Scott, T.M., King, C.J. & Walker, C., 1974. Trials with insecticide sprays to control elm bark beetles in logs. Quarterly Journal of Forestry 67(2): 1-4. 
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		| Walker, C. & King, C.J., 1974. Interception of the bark beetle Ips typographus (L.) imported from West Germany in spruce pulpwood billets. Plant Pathology 23: 166. 
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