BUIWER’S PETREL (Bulwer ia bulverii ): At-Sea Distribution and Abundance 
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The following maps represent all At-Sea observations made by 
personnel of the Pacific Ocean Biological Survey Program from February, 
1963 , through August, 1965. 
Each square represents one days observation from the first through 
the fifteenth of the month, while each circle represents one days 
observation from the sixteenth through the thirty-first of each month. 
Numbers refer to the actual number of birds observed during the day. 
Color code: 
yellow *» 0 birds 
green = 1-10 birds 
blue ox 11- SO birds 
red » 51-100 birds 
brown = 100+ birds 
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