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Business Reference Services (Science, Technology, and Business Division)
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Please be aware that letters sent to any Library of Congress office will be delayed because of current security procedures which mandate that all mail (U.S. Postal Service and private carrier) sent to the Library be screened off-site prior to arrival on Capitol Hill. This process can result in substantial delay in the delivery time for these letters. If you (or someone who can act on your behalf) have access to the Internet, we are able to provide more timely responses through our email Ask-A-Librarian service: Ask Business and Ask Science/Technology.
Business Questions

Science, Technology & Business Division
Business Reference Services
Library of Congress
101 Independence Ave. S.E.
Washington, D.C. 20540-4754
Science Questions

Science, Technology & Business Division
Science Reference Services
Library of Congress
101 Independence Ave. SE
Washington, DC 20540-4750
Science, Technology & Business Reading Room
Library of Congress
Room LA-508, Adams Building - 5th Floor
2nd Street SE, between Independence Avenue and East Capitol Street
Washington, D.C. 20540-4754
Reading Room Floor Plan
Maps and Floor Plans of the Three Buildings



Business: 202-707-3156

Science: 202-707-5639

Library of Congress Reference Correspondence Policy

The primary mission of the Library of Congress is to serve Members of the Congress and thereafter, the needs of the government, other libraries, and members of the public, universities, and learned societies.

The Library of Congress encourages correspondents to use local library resources first. Public, state, academic, and special libraries are often able to respond more quickly and thoroughly than we and are better able to identify and respond to specific and ongoing research needs.

Once correspondents have exhausted local and regional resources, they may seek assistance from the Library of Congress. Please note that the scope of our services does not include:

  • compilation of bibliographies
  • response to requests for information connected with school assignments,
    debates, and contests
  • research in heraldry or family history.


The Science, Technology & Business Division will provide a reasonable amount of basic information about materials in the collections of the Library relating to the sciences, technology, business, and economics; and will serve as the library of last resort for other questions relating to these subjects when local resources have been exhausted. Please indicate resources already consulted when requesting information about a wide-ranging subject.


The Library of Congress Photoduplication Service will not reproduce copyrighted material without written permission from the current copyright claimant. Securing such permission is the patron's responsibility. (see Copyright Office for more information)

Please note: All requests, regardless of the form in which they are received (postal service, email, phone, etc.) are treated equally.

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  August 18, 2012
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