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Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 25-28

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 35-36

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 36-43

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 80-89

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 89-103

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 144-148

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 148-160

Published in Journal of The Washington Academy of Sciences, in 1980, in volume 70, pages 160-165