Paperback
ISBN: 978-99937-639-6-3
ISBN-10: 99937-639-6-9
Pennsylvania Academy of Science ยท 1993
| See also: | ||
| 1994 | Paperback | Journal of the Pennsylvania Academy of Science, No 3 |
| 1993 | Paperback | Journal of the Pennsylvania Academy of Science, No 1 |
| 1992 | Paperback | Journal of the Pennsylvania Academy of Science, No 1 |