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 ↑ 21A               geological exploration of the subsurface and technical geological survey. Treatises and handbooks         ≈ 551.072    

 
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 ↑ 551.072               geological survey  → 912  ≈ `17B  `21A 

 

SciGator: explore University of Pavia libraries... — <http://scigator.unipv.it/indexe.php> : 2017.02.14 - 2024.09.18 -
« <http://www-dimat.unipv.it/biblio/dewey.php> : 2015.06.18 - 2017