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Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 3-11

Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 16-33

Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 38-41

Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 42-48

Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 60-75

Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 144-154

Published in Journal of The Washington Academy of Sciences, in 1977, in volume 67, pages 155-156