A theoretical foundation is provided for a method of identifying those books in a library's stack that determine any given percentage of the current circulation. Basic components and requirements of the technique are described, and the theory is applied in an example that manipulates data from a university library. (Author/MBR)

Discussion of models for library circulation data highlights a new statistical prediction model that creates a flexible regression curve. Linear graphs that result from previous models are discussed, bivariate discrete distributions are explained, and graphs that show library circulation for one year at a time are presented. (nine references) (LRW)

Data collected from an extensive review of 300 publications dealing with library cost studies are presented in 63 graphs. This probably includes most of the published data on costs of library technical processes up to the early 1970's. All data shown in this report has been corrected for general inflationary trends by converting the source data…