Research library

A research library is a library which contains an in-depth collection of material on one or several subjects.[1] A research library will generally include primary sources as well as secondary sources. Large university libraries are considered research libraries, and often contain many specialized branch research libraries. Research libraries are established to meet research needs and as such are stocked with authentic materials with quality content. In most cases research libraries are attached to research institutions or organizations.

The Library of Congress is one of the largest research libraries in the world