The primary delivery mechanism for sending materials to the borrowing library was the United States Postal Service. As tools pinpointing the location of items were developed, direct referrals became more feasible. With the advent of OCLC in the 1970's, it became possible to identify the holdings of a much wider number of libraries throughout the state and to create, send, and manage interlibrary loan traffic. Library staff currently use a wide variety of electronic sources to find information. Emerging technologies such as the Internet and the growth of shared automated library systems provide other resources.
Libraries also access databases which include citations, abstracts, and full text information.
Specialized networks such as the Medical Library Network have also improved resource sharing using technology. In 1997, The Division for Libraries and Community Learning hired Ruth Bessant, Library Consultant, to document and evaluate the status of current van delivery services in Wisconsin. The report, Delivery of Library Materials in Wisconsin, provides valuable background information and observations. Sixteen of the 17 public library systems operate or contract for weekly van delivery service in their regions. Northern Waters Library Service uses the U.S. Postal Service as the primary delivery method.