Published in Journal of The Washington Academy of Sciences, in 1982, in volume 72, pages 1-11

Published in Journal of The Washington Academy of Sciences, in 1982, in volume 72, pages 12-23

Published in Journal of The Washington Academy of Sciences, in 1982, in volume 72, pages 24-34

Published in Journal of The Washington Academy of Sciences, in 1982, in volume 72, pages 34-42