. Bulletin. Science. Aug. 1989 Mean = ± N = 438. Jan. 1991 Mean = ± N = 76 lu Julll Jan. 1992 Mean= ± N = 290 IhJiU — — <N tS (S June 1992 Mean= ± N = 636. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy

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