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Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 29-38

Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 38-45

Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 46-49

Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 77-85

Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 117-119

Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 187-191

Published in Journal of The Washington Academy of Sciences, in 1969, in volume 59, pages 192-202