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Annual district reports: forest insect and disease survey, prairie region, 1972. 1973. Robins, J.K.; Patterson, V.B.; Still, G.N.; Mortensen, K.L.; Gautreau, E.J.; Tidsbury, R.C.; Petty, J.; Smith, G.J.; Caltrell, R.M.; Susut, J.P. Canadian Forestry Service, Northern Forest Research Centre, Edmonton, Alberta. Information Report NOR-X-54.