en
55 Earth sciences & geology
551 Geology, hydrology, meteorology
551.01 Philosophy and theory of geology 551.09 History, geographic treatment, biography of geology 551.1 Gross structure and properties of the earth 551.2 Volcanoes, earthquakes, thermal waters and gases 551.3 Surface and exogenous processes and their agents 551.4 Geomorphology and hydrosphere 551.5 Meteorology 551.6 Climatology and weather 551.7 Historical geology 551.8 Structural geology 551.9 Geochemistry
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