Vodni problemi.
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| OCLC: | 2410457 |
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| 企业作者: | |
| 语言: | Bulgarian |
| 出版: |
[Sofi︠i︡a,
Izd-vo na Bŭlgarskata akademi︠i︡a na naukite]
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| 主题: | |
| 格式: | 序列 Note that CRL will digitize material from the collection when copyright allows. |
| 出版: | kn. 1- 1975- |
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| 实物描述: | ill. 24 cm. |
| ISSN: | 0204-8248 |