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Google圖書搜尋
The Breeding Bird Survey, 1967 and 1968
Chandler S. Robbins
Willet T. Van Velzen
出版
U.S. Department of the Interior, Fish and Wildlife Service, Bureau of Sport Fisheries and Wildlife
, 1969
URL
http://books.google.com.hk/books?id=LociAQAAIAAJ&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
Routes are selected at random on the basis of one-degree blocks of latitude and longitude. Each 24.5 mile route, with 3 minute stopes spaced one-half mile apart, is driven by automobile. All birds heard or seen at the stops are recorded on special forms and the data are then transferred to magnetic tape for analysis.
