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<http://webisa.webdatacommons.org/383817166>	<http://www.w3.org/ns/prov#value>	"Thus, the metallic compounds which may be looked upon as derivatives of the metallic oxides are generally highly effective and we may use the selenates, sulfates, tungstates or other compounds related to the metallic oxides which have been indicated above and derived from the indicated metals." .
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