id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
challenge-27	Ferguson, Ronald F.	Racial Patterns in How School and Teacher Quality Affect Achievement and Earnings	1991	36	.pdf	application/pdf	1	1	36	Chal_v2n1_May1991.pdf	cache/challenge-27.pdf	txt/challenge-27.txt