In order to determine the extent of loss due to theft of books and bound journals from the main stacks of Doe Library, three types of inventories were conducted: a volume count, an item-by-item inventory of the D-classed materials, and three sample inventories. Depending on certain assumptions, the results show that losses could range as high as 4.48 percent and that there is strong evidence of an increasing rate of theft. Recommendations for improving methodology in a proposed follow-up to this study are provided, as well as tables presenting the collected data. Appended are the results of the loan department service survey, a draft proposal for measuring the level of theft from the main stacks of Doe Library, and the code book for those who desire to obtain in machine-readable form the data collected in the sample inventories. (JD)