Published in Bulletin of The British Museum (Natural History) Geology, in 1950, in volume 1, pages 69-89

Published in Bulletin of the British Museum (Natural History). Geology., in 1950, in volume 1, issue 3, pages 49-90

Published in Bulletin of the British Museum (Natural History). Geology., in 1950, in volume 1, issue 4, pages 93-146