id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
hindsight-3601	Editors, Hindsight	Vol 20, No 1 (1989)	1989	12	.pdf	application/pdf	4027	182	54	The catalogs themselves serve as a valuable guideline for appraising old books being considered as donations as well as for sale or purchase in so far as dealers' prices may be presumed to reflect the marketplace. statements pointing up such historical details as the role of the moveable-type printing press in the demand for spectacles, contact lens invention, use of scleral contacts, first school for the blind, first eyeglasses in America, invention of spectacle temples, early use of quartz and crystal for lenses, the role of vanity in eyeglass usage, early Chinese tinted lenses, the evolution of spectacle frames, and eyeglasses of various u.s. presidents.	cache/hindsight-3601.pdf	txt/hindsight-3601.txt