| ID | 035547 |
| Call Number | 032/PRO |
| Title Proper | Great Soviet encyclopedia vol.20 |
| Language | ENG |
| Author | Prokhorov A.M. editor |
| Edition Statement | 3rd edn. |
| Publication | New York, Macmillan Inc., 1979. |
| Description | xxii,685p. |
| Classification Number | 032 |
| Key Words | Encyclopedias and dictionaries ; Knowledge,books of ; Reference books |