id	keyword
crl-15685	information
crl-15685	historians
crl-15685	sources
crl-15685	research
crl-15685	history
crl-15685	use
crl-15685	library
crl-15685	information sources
crl-15685	books
crl-15685	journal
crl-15685	citations
crl-15685	humanities
crl-15685	american
crl-15685	articles
crl-15685	survey
crl-15685	online
crl-15685	study
crl-15685	primary
crl-15685	libraries
crl-15685	databases
crl-15685	web
crl-15685	percent
crl-15685	analysis