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Science Reference Services (Science, Technology, and Business Division)
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Science Reference Services

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Science, Technology & Business Division
Science Reference Services
Library of Congress
101 Independence Ave. SE
Washington, DC 20540-4750

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 Science/Technology.


Science Reference Services
(202) 707-5639


(202) 707-1925

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

Library of Congress Reference Correspondence Policy

The Library preserves and provides access to a rich, diverse and enduring source of knowledge to inform, inspire and engage you in your intellectual and creative endeavors. Whether you are new to the Library of Congress or an experienced researcher, we have a world-class staff ready to assist you online and in person.

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 and are better able to identify and respond to specific and ongoing research needs.


The Science Reference Section will provide a reasonable amount of information about materials in the collections of the Library relating to science and technology. Please indicate resources already consulted when requesting information about any subject.


The 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.)

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   September 16, 2021
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