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 ↑ 21E               geological exploration of the subsurface. Earthquakes         ≈ 551.22    

 
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 ↑ 551.22               seismology, earthquakes  → 620.3  624.176  ≈ `21E  `24B 

 

SciGator: explore University of Pavia libraries... — <http://scigator.unipv.it/indexe.php> : 2017.02.14 - 2024.11.12 -
« <http://www-dimat.unipv.it/biblio/dewey.php> : 2015.06.18 - 2017