id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
crl-11710	Grove, Lee E.	Paper Deterioration-An Old Story	1964-08-31	10	.pdf	application/pdf	6793	259	56	The more important of these, so far as concerns this country, may be noted in chronological order, thus: esparto, in the period 1860-70; 'mechanical wood' or ground wood pulp, in 1870-80; the wood celluloses, in the period 1880-90.13 After finding that such factors as illuminating gas, acidity in the instance of mid-century rag papers, and oxidation in the instance of mechan- ical wood pulp, were involved in dete- rioration, 14 the committee enumerated four classes, or qualities, of papermaking fibers and described specifications for book papers to be used in publications of presumably permanent value. At the end of the fifteenth century, Johann Tritheim, a Benedictine abbot, was sufficiently troubled about paper to wonder how long a book printed on it would last.	cache/crl-11710.pdf	txt/crl-11710.txt