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<http://webisa.webdatacommons.org/191691350>	<http://www.w3.org/ns/prov#value>	"A review of the essential features of each of the gross types of stones may simplify our classification and facilitate the study of the pathogenesis of biliary calculi.Cholesterin Stone. ???Cholesterin stones have been classified in three groups by the pathologist: (1) the pure cholesterin stone, which contains free or" .