Maataloushallituksen hydrologiset tutkimukset vuosina 1965...1968 : Hydrologic investigations by the Board of agriculture during the years 1965 to 1968
Maataloushallituksen hydrologiset tutkimukset vuosina 1965...1968 : Hydrologic investigations by the Board of agriculture during the years 1965 to 1968
Maataloushallituksen hydrologiset tutkimukset vuosina 1965...1968 : Hydrologic investigations by the Board of agriculture during the years 1965 to 1968
Maataloushallituksen hydrologiset tutkimukset vuosina 1965...1968 : Hydrologic investigations by the Board of agriculture during the years 1965 to 1968