The aim of this study is to examine the kinds of materials that are not currently available through the Science Information System in Japan. We used a logistic model with books that were not in the collection as the dependent variable, and location of publication, type of publisher, year of publication, and field as independent variables to determine the nature of the books that were not in the collection. It was found that books from the following locations were most likely to be in the collection (in this order): Japan, North and South America, United Kingdom, Europe (not including United Kingdom), Asia, Africa, and Oceania. Books from the later regions were less likely to appear in the collection. The following publisher types were likely to be found in the collection (in the following order)with books by the later types of publishers being less likely to be available: publishing companies, private companies/conferences, governmental organizations, and universities. Books published before 1979 were less likely to be in the collection. Finally, books from the following fields were likely to be found in the collection (in this order)with books from the later fields being less likely to be available: humanities, pure sciences, engineering, social sciences, and life sciences. In particular, in the fields of engineering and life sciences, there is great demand for data collections, instruction manuals, and procedures manuals, so the likelihood of not finding them in the collection was increased.