Published in Proceedings of the California Academy of Sciences, in 1991, in volume 47, pages 175-206

Published in Proceedings of the California Academy of Sciences, in 1991, in volume 47, pages 275-288

Published in Proceedings of the California Academy of Sciences, in 1991, in volume 47, issue 5, pages 159-174

Published in Proceedings of the California Academy of Sciences, in 1991, in volume 47, issue 7, pages 207-233

Published in Proceedings of the California Academy of Sciences, in 1991, in volume 47, issue 8, pages 235-274

Published in Proceedings of the California Academy of Sciences, in 1991, in volume 47, issue 10, pages 289-302