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 ↑ 660.28                    chemical plants and activities         → 540       
 ↑ 660.283                         equipment for processes, piping             
 ↑ 660.284                         unit operations and processes             

 
See also:

 ↑ 540                         chemistry in general  → 016.54  660.28  ≈ `59A  S.SPEC.36.CB 

 

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