id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ital-5739	McGee, Rob	Two Types of Designs for On-Line Circulation Systems	1972-09-01	19	.pdf	application/pdf	8523	483	56	Item systems are characterized by three or four major files: 1) a user file; 2) an item file of bibliographic records for all library volumes or titles, or for as many as machine records can feasibly be created and stored; 3) a transaction file that may be used for update of the item file, data collection and analysis, and perhaps notice generation; and optionally 4) an absence file of records for circulating items, if transaction data for them are more efficiently kept here than in the item file. Item systems are in operation at Bell Laboratories library ( 18,19 ), Eastern Illinois University library ( 20), Ohio State University libraries ( 21,22 ), and the Technical Library of the Manned Spacecraft Center, Houston ( 23).	cache/ital-5739.pdf	txt/ital-5739.txt