Environmental care in member countries of the Council of Mutual Economic Assietance. Bulgarian People´s Republic, Czechoslavak Socialist Republic, German Domoor. Republic, Hungarian People´s Republic, People´s Republic of poland, Rumanian Socialist. Republic, Union of Soviet Socialist Republics /
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| Typ dokumentu: | Kniha |
| Jazyk: |
angličtina |
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Praha :
Propag. tvorba,
1973.
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