Paperback
ISBN: 978-99937-639-9-4
ISBN-10: 99937-639-9-3
Pennsylvania Academy of Science ยท 1994
| See also: | ||
| 1993 | Paperback | Journal of the Pennsylvania Academy of Science, No 1 |
| 1993 | Paperback | Journal of the Pennsylvania Academy of Science, No 2 |
| 1992 | Paperback | Journal of the Pennsylvania Academy of Science, No 1 |