id	keyword
concept-251	history
concept-251	turner
concept-251	new
concept-251	beard
concept-251	becker
concept-251	progressive
concept-251	american
concept-251	university
concept-251	press
concept-251	midwestern
concept-251	york
concept-251	historical
concept-251	hofstadter
concept-251	historians
concept-251	frontier
concept-251	university press
concept-251	reform
concept-251	writing
concept-251	past
concept-251	new york
concept-251	age
concept-251	people
concept-251	charles
concept-251	novick
concept-251	time
concept-251	century
concept-251	carl
concept-251	nye