Information retrieval for hierarchical set of descriptors /
Wedi'i Gadw mewn:
| OCLC: | 17305104 |
|---|---|
| Prif Awdur: | |
| Iaith: | English |
| Cyhoeddwyd: |
Warszawa :
PKiN,
1974.
|
| Cyfres: | CC PAS reports ;
v.138. |
| Fformat: | Monograph Note that CRL will digitize material from the collection when copyright allows. |