Published in Proceedings of the California Academy of Sciences, in 1939, in volume 22, pages 187-193

Published in Proceedings of the California Academy of Sciences, in 1939, in volume 22, pages 195-206

Published in Proceedings of the California Academy of Sciences, in 1939, in volume 22, pages 207-220

Published in Proceedings of the California Academy of Sciences, in 1939, in volume 23, pages 381-392

Published in Proceedings of the California Academy of Sciences, in 1939, in volume 23, pages 415-425

Published in Proceedings of The California Academy of Science (4Th Series), in 1939, in volume 23, pages 427-436

Published in Proceedings of the California Academy of Science (4th Series), in 1939, in volume 23, issue 24, pages 367-380