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 ↑ 668.6               agricultural chemical substances, pesticides         → 632       

 
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 ↑ 632               plant pathology, biological and chemical control  → 581  668.6  ≈ S.SPEC.34.HA 

 

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