Number of Pairs, Timing of Egg-Laying and Clutch Size in a Subalpine Sand Martin Riparia riparia Colony, 1968-1985, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 17, No. 3 (Jul., 1986), pp. 221-229
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Sören Svensson (1986) studied this question.
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