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An annual reference directory listing contact information for the headquarters and central offices of major businesses, organizations, institutions, agencies, and corporations in the United States and Canada. Volume 1 typically contains alphabetical listings by organization name, including full mailing addresses, telephone numbers, and often fax numbers and web addresses for each entry, providing a comprehensive resource for researchers, librarians, and professionals needing verified primary contact information. Volume 2 (if bound as a two‑volume set) usually provides the same information classified by subject. The series is widely used in libraries as an authoritative business and organizational directory.

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245: $a: Headquarters USA: A Directory of Contact Information for Headquarters and Other Central Offices of Major Businesses & Organizations in the United States and in Canada
245: $b:
082: $a:
100: $a: Corporate editors
650: $a: Reference
250: $a:
440: $v:
250: $b: Omnigraphics
250: $c: 2010
020: $a: 1531‑2909
300: $a: 2500+