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Published in Journal of The Washington Academy of Sciences, in 1979, in volume 68, pages 62-64

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 12-17

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 17-20

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 65-74

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 151-158

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 159-163

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 164-174

Published in Journal of The Washington Academy of Sciences, in 1979, in volume 69, pages 174-179