The document provides guidance on using WorldCat for genealogical research, emphasizing its extensive catalog of over 84 million records from various libraries worldwide. It outlines different types of genealogical materials available, such as family histories, cemetery records, and military records, along with step-by-step instructions for accessing and effectively searching WorldCat. Additionally, it offers strategies for searching by family name, geographic location, ethnicity, occupation, and religious affiliation to locate relevant historical resources.