551.4 Geomorphology and hydrosphere
551.48 Hydrology
551.4809012 Hydrology (Fresh waters)--to 4000 B.C. 551.48099923 Hydrology (Fresh waters)--Mars 551.482 Lakes and inland seas 551.483 Rivers and streams 551.484 Waterfalls 551.488 Runoff 551.489 Floods
Dewey Decimal Classification
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