Classification. Class S: Agriculture, plant and animal industry, fish culture and fisheries, hunting sports
| Awduron Eraill: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Washington
U. S. Government Printing Office
1954
|
| Rhifyn: | 3rd ed. |
| Pynciau: |