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"Audio materials in the collections of the Library of Congress can be reproduced only when all rights restrictions have been cleared. These may include donors, copyright holders, record companies, artists, radio networks, licensing organizations, unions, etc. The Motion Picture Broadcasting and Recorded Sound Division (M/B/RS) requires anyone wishing to obtain copies to secure written authorization for the Library to make the reproductions from any and all rights holders. While M/B/RS Reference staff can usually be of some assistance in determining what permissions are required, the onus is on the researcher to obtain them. We strongly urge requestors to listen to recordings before ordering. Since our cataloging information often derives from print sources, not the actual recording, we cannot guarantee that our catalog records for unpublished materials reflect the tape contents in all cases. In addition, the audio quality may vary, as it is dependent on the fidelity and condition of the original recording. After contacting M/B/RS reference staff to identify the specific items to be copied, audio requestors will be referred to the Division's Public Services Office, which serves as the business arm of the M/B/RS Magnetic Recording Laboratory. In addition to other outreach services, the Public Services Office operates a fee- for-service operation for the duplication of audio and moving image materials."

"Chronicling America provides free access to more than a million historic American newspaper pages. Listed here are topics widely covered in the American press of the time. We will be adding more topics on a regular basis.

When we think about difficult concepts, it helps to think with models, smaller versions of systems that we can hold in our minds or sketch on paper. Science teachers, as well as the Next Generation Science Standards, recognize the importance of understanding models. Primary sources from the Library of Congress collections invite students to explore how different models of the universe have developed over time, and to think a bit more generally about interpreting models.

The U.S. ISSN Center, part of the international ISSN Network, assigns International Standard Serial Numbers (ISSN) to serials published in the U.S. The ISSN is a standard identifier for serials (e.g., journals, magazines, newsletters, newspapers, annuals) whether published in print, online or other media. Each medium version is assigned a separate ISSN.

"Web site is brought to you from the Library of Congress in Washington, D.C., the largest library in the world and the nation's library. We hope you will find this Web site entertaining and fun to use. And, of course, we hope you will learn something from it. The site was designed especially with young people in mind, but there are great stories for people of all ages, and we hope children and their families will want to explore this site together."