The Microform and Electronic Resources Center (the former Computer Catalog Center) is located on the first floor of the Jefferson Building (LJ 139), across the hall from the Main Reading Room. It is open to the public and staffed by reference librarians from 8:30 a.m. to 7:00 p.m. Mondays, Wednesdays, and Thursdays; and from 8:30 a.m. to 5:00 p.m. on Tuesdays, Fridays, and Saturdays. From 7:00 to 9:30 p.m. on Mondays, Wednesdays, and Thursdays, the Center is open to the public but unstaffed.

Workstations for searching the Library of Congress Online Catalog are located in the Center. These workstations also provide general access to the Internet, including a number of Internet-based subscription services. The Center has special equipment for researchers with disabilities.

Photocopying and printing is available in the Center. See the Library's Copying and Printing Services page for more details.

Researchers are required to have a valid Reader Identification Card in order to use the public workstations in the Microform and Electronic Resources Center (LJ-139, the former Computer Catalog Center). They must also check briefcases, backpacks, luggage, overcoats, and other personal belongings in one of the two cloakrooms on the ground floor of the Jefferson Building.

Researchers can sign up, either in person or by phone (202-707-3370) during the hours when the Center is staffed, for Library of Congress Research Orientations.