BREEDING BIOLOGY OF GANNET SULA BASSANA ON BASS ROCK SCOTLAND

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[51] RICE DALE W., 1962, AUK, V79, P517

[52] Richdale L. E., 1945, Condor Berkeley, V47, P45, DOI 10.2307/1364035

[53] Richdale L. E., 1957, POPULATION STUDY PEN

[54] RICHDALE LE, 1951, SEXUAL BEHAVIOUR PEN

[55] Salmon H. M., 1933, British Birds, V27, P142

[56] SAUNDERS H, 1884, HISTORY BRITISH BIRD, V4

[57] SNOW B., 1963, BRIT BIRDS, V56, P164

[58] SNOW BARBARA, 1960, IBIS, V102, P554, DOI 10.1111/j.1474-919X.1960.tb07132.x

[59] SNOW BARBARA K., 1963, BRIT BIRDS, V56-56, P77

[60] SNOW D. W., 1958, IBIS, V100, P1, DOI 10.1111/j.1474-919X.1958.tb00362.x