information science
type: Concept
narrower: information storage devices

CD-ROM
type: Concept
broader: information storage devices

video discs
type: Concept
broader: information storage devices

information storage devices
type: Concept
narrower: video discs
narrower: microfilm
narrower: CD-ROM
broader: information science

microfilm
type: Concept
broader: information storage devices

concepts
type: Collection
type: ConceptGroup
member: information storage devices