Fig. 4
From: Accumulation of wear and tear in archival and library collections. Part II: an epidemiological study
a Scatterplot showing the percentage of failed sheets of inventory numbers dating from 1600 to 2000. The vertical dashed line represents the transition from rag to wood-based fibre paper. b The same plot, with linear regression, only including inventory numbers dating post 1850 that have been accessed less than 8 times since 1998. One outlier is not included. Both plots show inventory numbers containing more than 100 sheets