id	keyword
ch-6876	history
ch-6876	public
ch-6876	historical
ch-6876	social
ch-6876	studies
ch-6876	world
ch-6876	new
ch-6876	study
ch-6876	education
ch-6876	students
ch-6876	national
ch-6876	past
ch-6876	teaching
ch-6876	american
ch-6876	textbooks
ch-6876	aha
ch-6876	cronon
ch-6876	university
ch-6876	address
ch-6876	york