almanacs
type: Concept
broader: reference books

atlases
type: Concept
broader: reference books

books (publishing)
type: Concept
narrower: reference books

concepts
type: Collection
type: ConceptGroup
member: reference books

dictionaries as topic
type: Concept
broader: reference books

directories as topic
type: Concept
broader: reference books

dispensatories
type: Concept
broader: reference books

encyclopedias as topic
type: Concept
broader: reference books

formularies as topic
type: Concept
broader: reference books

medical reference books
type: Concept
broader: reference books

pharmacopoeias as topic
type: Concept
broader: reference books

reference books
type: Concept
broader: books (publishing)
narrower: encyclopedias as topic
narrower: dictionaries as topic
narrower: dispensatories
narrower: pharmacopoeias as topic
narrower: medical reference books
narrower: atlases
narrower: formularies as topic
narrower: directories as topic
narrower: almanacs