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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 online Ask-A-Librarian service: Ask Business and Ask Science/Technology.

Before submitting your request, we recommend that you review our Reference Correspondence Policy.

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-500, 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 and 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. Please note that the scope of our services does not include:


The Science, Technology & Business Division will provide a reasonable amount of information about materials in the collections of the Library relating to the sciences, technology, business, and economics. Please indicate resources already consulted when requesting information about a wide-ranging subject.


Library of Congress Duplication Services 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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  June 26, 2023
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