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 ↑ 20D               applied geology. Landslides. Arrangements         ≈ 551.3    

 
See also:

 ↑ 551.3               surface processes, rock fall, landslides  → 624.151  631.4  ≈ `20D  `32E 

 

SciGator: explore University of Pavia libraries... — <http://scigator.unipv.it/indexe.php> : 2017.02.14 - 2020.09.29 -
« <http://www-dimat.unipv.it/biblio/dewey.php> : 2015.06.18 - 2017.02.14