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↑	`668`	technology of other organic products
↑	`668.1`	surfactants
↑	`668.4`	plastics
↑	`668.5`	perfumes, cosmetics
↑	`668.6`	agricultural chemical substances, pesticides	→ `632`
↑	`668.9`	polymers	→ `547.7 620.19`

See also:

↑ 547.7                macromolecules, polymers   → 620.19 668.9
↑ 620.19                other materials, polymers   → 547.7 668.9
↑ 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 - 2020.09.29 -
« <http://www-dimat.unipv.it/biblio/dewey.php> : 2015.06.18 - 2017.02.14

↑	`547.7`	macromolecules, polymers	→ `620.19 668.9`
↑	`620.19`	other materials, polymers	→ `547.7 668.9`
↑	`632`	plant pathology, biological and chemical control	→ `581 668.6 ≈ S.SPEC.34.HA`