This directory provides an exhaustive listing of periodicals published in the United States and Canada. It details approximately 85,000 publications issued at least every two years, encompassing a wide array of types from consumer magazines and trade journals to government publications and association proceedings. The information is organized alphabetically by subject classification and title, offering robust finding aids for users. Each entry contains up to 46 distinct fields of data, averaging around 25 pieces of information per listing.

This directory is recognized as a comprehensive resource for identifying US and Canadian periodicals, cited in major bibliographic guides such as BCL3, Sheehy, and Walford. Its extensive data on 85,000 publications, covering a broad spectrum of periodical types, makes it an invaluable tool for researchers and librarians. The alphabetical arrangement by subject and title, coupled with detailed finding aids, ensures efficient access to information. The depth of data provided for each entry, averaging 25 fields, further solidifies its utility as a definitive reference work.