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Observations on Mass Flights and Other Activities of the Migratory Grasshopper

John Robert ParkerRoy C. NewtonRobert Leslie Shotwell

出版	U.S. Department of Agriculture, 1955
URL	http://books.google.com.hk/books?id=KrMXAAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN