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 ↑ 551.7               historical geology         ≈ 17D  19B    

 
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 ↑ 17D               historical geology    ≈ 551.7 
 ↑ 19B               stratigraphic geology    ≈ 551.7 

 

SciGator: explore University of Pavia libraries... — <http://scigator.unipv.it/indexe.php> : 2017.02.14 - 2024.11.12 -
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