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ROBERTSON, H.G. & WOOLLER, R.D. (1981). Seasonal decrease in the clutch size of Hartlaub's Gulls Larus hartlaubii at Strandfontein in 1978
        Marine Ornithology, 9(1), 
        23-26.
        
        http://doi.org/10.5038/2074-1235.9.1.56
      
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