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Daily Bright Sunshine 1941-1970
B. J. YorkeG. R. Kendall
出版Atmospheric Environment Service, 1972
URLhttp://books.google.com.hk/books?id=8M-BgT_MX5sC&hl=&source=gbs_api
註釋"Normal values of daily bright sunshine for each month and the year, based on the period 1941 to 1970, are listed in this circular"--page 1.