A cartographic history of spruce budworm defoliation from 1967 to 1981 in eastern North America =
Subtitle: Historique en cartes de la défoliation causée par la tordeuse des bourgeons de l'épinette dans l'est de L'Amérique du Nord de 1967 à 1981 /by E. G. Kettela.. --
Series: Information report / Canadian Forestry Service -- DPC-X-14; Information report (Canadian Forestry Service) -- DPC-X, 14
Publisher: Environment Canada, Canadian Forestry Service, 1983.
Published: 1983
Place of publication: Ottawa
Language: eng
Subjects: Spruce budworm -- Canada
Notes: iv, 8 p. : maps (1 fold. col.) --  English and French. Bibliography: p. 7.