id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
crl-26029	Bogus, Ian; Yano, Candace Arai; Zachary, Shannon; Nadal, Jacob; Miller, Mary; Levenson, Helen N.; Brody, Fern; Amato, Sara	A Model to Determine Optimal Numbers of Monograph Copies for Preservation in Shared Print Collections	2023	35	.pdf	application/pdf	18299	611	42	If one is concerned about potential adverse correlations, one option is to overstate the risks when choosing numbers, which will lead to conservative choices about the number of book copies to retain. In this paper, we develop a quantitative model that enables us to identify tangible reten- tion targets based on what is known about the key reasons that copies of book titles become lost, unusable, or otherwise unavailable over time.† We specifically include the following fac- tors in the model: (1) on-shelf probability—the probability that an accurately-cataloged book is on the shelf or in a known location; (2) bibliographic record inaccuracy—the bibliographic record differs from the item known to be on the shelf; (3) annual loss rate—the annual rate at which copies are physically lost from the collection; (4) physical deterioration over time—the * For our purposes, an “average book” is one that represents traits most commonly held in libraries.	cache/crl-26029.pdf	txt/crl-26029.txt