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Annual district reports: forest insect and disease survey, prairies region, 1974. 1975. Patterson, V.B.; Still, G.N.; Emond, F.J.; 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-125.