Services we provide
Basic research assistance related to science, technology, and engineering
Answers to queries requiring resources unique to the Library of Congress
Resources for teachers and science fair participants
Information on technical reports and standards
Response within 5 business days

Services we cannot provide
answers for student assignments
answers for contests, puzzles or games
copies of scientific books and periodicals
Many questions can be answered using
USA.gov for Science and Technology
Library of Congress Online Catalog
Library of Congress Virtual Reference Shelf
Virtual Reference Desk AskA+ Locator

Ask a Librarian:
If you have a reference question, proceed to the online form; get answers via email.

Contact us by phone or fax:
  Phone: (202) 707-5639, 707-1205
  Fax: (202) 707-1925

Send us written correspondence*:
  Science, Technology and Business Division
  Library of Congress
  101 Independence Ave. SE
  Washington, D.C. 20540-4750

* please read - information on mail delays

Visit our Web Pages:
Science Reference Services
Technical Reports and Standards
Selected Internet Resources in Science
Science Tracer Bullet Series
Science Reference Guides
Business Reference Services

Certain types of questions are better directed elsewhere. Your local library can direct you with books, special online indexes, full text products, pamphlets, and other useful resources:
Resources for school assignments in the US
Photoduplication services
Interlibrary loan
American Memory for digitized resources in the Library’s collections
Frequently Asked Questions about the Library