| وصف مادي: | xxiv, p. 300. 22cm. |
|---|---|
| بيبلوغرافيا: | Submitted to the faculty of the University of Pennselvania in partial fulfilment of the requirments for the degree of doctor of philosophy May, 1989 |
| وصف مادي: | xxiv, p. 300. 22cm. |
|---|---|
| بيبلوغرافيا: | Submitted to the faculty of the University of Pennselvania in partial fulfilment of the requirments for the degree of doctor of philosophy May, 1989 |