Published in Bulletin Br Orn Club, in 1973, in volume 93, pages 111-114

Published in Bulletin Br Orn Club, in 1973, in volume 93, pages 139-140

Published in Bulletin Br Orn Club, in 1973, in volume 93, pages 141-142

Published in Bulletin Br Orn Club, in 1973, in volume 93, pages 143-144

Published in Bulletin of the British Ornithologists' Club, in 1973, in volume 93, issue 4, pages 145-155