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Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 5-14

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 15-17

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 19-58

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 59-63

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 65-96

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 97-102

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 111-116

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 117-118

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 119-121

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 123-127

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 129-130

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 139-145

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 181-182

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 183-188

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 189-192

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 193-197

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 199-202

Published in Transactions of the Royal Society of South Africa, in 1918, in volume 7, issue 1, pages 203-212