International legend for hydrogeological maps= Leyenda internacional para mapas hidrogeologicos= Legende internationale des cartes hydrogeologiques= Mezhdunarodnaia legenda k gidrogeologicheskim kartam
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| Format: | Book |
| Language: | English French Russian |
| Published: |
Mezhdunarodnaia legenda k gidrogeologicheskim kartam Paris:
Unesco,
1970
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