Published in Journal of The Washington Academy of Sciences, in 1972, in volume 61, pages 124-128
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 2-16
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 23-31
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 32-35
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 36-40
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 41-42
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 56-87
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 88-102
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 140-144
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 144-153
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 153-156
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 157-161
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 174-183
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 184-189
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 214-218
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 248-257
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 258-260
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 261-264
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 265-267
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 317-328
Published in Journal of The Washington Academy of Sciences, in 1972, in volume 62, pages 332-333