Studying works allows us to see empirically the problem of instantiation of works, both at large and in the catalog. The linkage of relationships among works is a critical goal for information retrieval because the ability to comprehend and select a specific instantiation of a work is crucial for the advancement of scholarship. Hence, the present study examines the instantiation of works among a set of entities known to be popular-best selling books of the 20th century. A sample of best selling works (fiction and non-fiction) from 1900-1999 was constructed. For each work in the sample, all bibliographic records were identified in both OCLC and RLIN as well as instantiations on the World Wide Web. All but one work in the sample exists in multiple instantiations; many have large networks; and complex networks of instantiations have begun to appear in full text on the Web. The results of this study demonstrate the importance of continuing to gather statistical data about works. Solutions devised for the catalog will need to be modified for use in the chaotic environment of the World Wide Web and its successors. doi:10.1300/J104v44n03_02