A Guide to the study of fresh-water biology.
| Prif Awdur: | |
|---|---|
| Awduron Eraill: | |
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
San Francisco
Holden-Day
1962.
|
| Rhifyn: | 5th ed., rev. and enlarged. |
| Prif Awdur: | |
|---|---|
| Awduron Eraill: | |
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
San Francisco
Holden-Day
1962.
|
| Rhifyn: | 5th ed., rev. and enlarged. |