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Report on Aerial Spraying Against the Spruce Budworm in 1956 in the Lower St. Lawrence and Gaspe Peninsula and Status of the Infestation at the End of 1956

J. R. BlaisR. Martineau

出版	Canada, Department of Agriculture, 1957
URL	http://books.google.com.hk/books?id=xTfGswEACAAJ&hl=&source=gbs_api