id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
crl-14518	American Library Association, 	Letters	1989	2	.pdf	application/pdf	881	44	37	College and Research Libraries Letters To the Editor: Recent articles such as those by Whitlatch 1 and Douglas2 have discussed the use and ap- propriateness of unobtrusive testing of reference services. Unobtrusive testing, like any other methodology, merits rigorous review and assessment.	cache/crl-14518.pdf	txt/crl-14518.txt