id	keyword
commonwealth-501	pennsylvania
commonwealth-501	book
commonwealth-501	pittsburgh
commonwealth-501	university
commonwealth-501	new
commonwealth-501	city
commonwealth-501	history
commonwealth-501	left
commonwealth-501	constitution
commonwealth-501	press
commonwealth-501	philadelphia
commonwealth-501	war
commonwealth-501	development
commonwealth-501	work
commonwealth-501	public
commonwealth-501	politics
commonwealth-501	thomas
commonwealth-501	branning
commonwealth-501	residents
commonwealth-501	convention
commonwealth-501	american
commonwealth-501	urban
commonwealth-501	lancaster